From the question given, we are to convert -4⁰F to K
The standard value of ⁰F to K is
1⁰F = 255.93K
-4⁰F = x
Let's solve for -4⁰F
[tex]-4+255.93K=253.15K[/tex]From the calculations above, -4⁰F is equal to 253.15K
A 22 g sample of krypton exerts a pressure of140 mTorr at 40°C. What is the volume ofthe container?Answer in units of L
Answer
Volume = 36669.3 L
Explanation
Given:
Mass of krypton = 22 g
Pressure = 140 mTorr = 0.14 Torr
Temperature = 40°C = 313 K
Required: Volume
We know:
Molar mass of krypton = 83,798 g/mol
R constant in torr = 62.363577 L.Torr/K/mol
Solution:
Step 1: Find the number of moles of krypton
n = m/M where n is the number of moles, m is the mass and M is the molar mass
n = 22 g/83,798g/mol
n = 0.263 mol
Step 2: Find the volume using the ideal gas law
PV = nRT
V = nRT/P
V = (0.263 mol x 62.363577 L.Torr/K/mol x 313 K)/0.14 torr
V = 36669.3 L
How many moles of O2 is in a 5.6 L sample of O2 measured at 250 kPa and 18°C?
Answer
578.66 mol
Explanation
Given:
Volume, V = 5.6 L
Temperature, T = 18° C = 18 + 273 = 291 K
Pressure, P = 250 kPa = 250000 Pa
Using the ideal gas equation, we can solve for the number of moles:
[tex]PV=\text{nRT}[/tex]Put the given values into the ideal gas equation to get the number of moles:
[tex]\begin{gathered} 250000\times5.6=n\times8.314\times291 \\ 1400000=2419.374n \\ \text{Divide both sides by 2419.374} \\ \frac{1400000}{2419.374}=\frac{2419.37n}{2419.374} \\ n=578.66\text{ mol} \end{gathered}[/tex]Options for the first box: less then, equal to, greater than Options for the second box: is greatest, is least, equals standard pressure
Water boils when the vapor pressure is equal to the atmospheric pressure.
The atmospheric pressure is least at the top of the mountain.
in the periodic table how would you group copper, chlorine, iodine, vanadium, astatine ? (based on columns) A. (copper, vanadium) (chlorine, iodine, astatine)B. (copper, astatine) (chlorine, iodine, vanadium)C. (copper, chlorine, iodine) (vanadium, astatine)D. (copper, astatine, vanadium) (chlorine, iodine)
1) Characteristics of the elements mentioned.
Chlorine, Iodine, and Astatine are nonmetals. They are in the 17th group the halogens. They're in the p-block
Copper and Vanadium are transition metals. They're in the d-block.
We can group these elements in metals (Copper and Vanadium) and nonmetals (Chlorine, Iodine, and Astatine)
At sea level, there are approximately 2.6 × 1025 molecules m–3 of the atmosphere. There are 5.20 × 1021 molecules m–3 of one of the gases making up the atmosphere. What is the concentration of this gas as a proportion of the total number of molecules in the atmosphere, expressed in parts per million (ppm)?
Answer:
[tex]200\text{ ppm}[/tex]Explanation:
Here, we want to calculate the concentration of the gas in ppm
What we have to do here is to divide the number of molecules of the gas by the total number of molecules in the atmosphere, after which we can convert it to ppm
Mathematically, we have that as:
[tex]\frac{5.20\text{ }\times\text{ 10}^{21}}{2.6\times10^{25}}\text{ = 0.0002}[/tex]Now, we have to convert to ppm
To convert to ppm, we simply have to multiply the given ratio by 1,000,000
We have this as:
[tex]0.0002\text{ }\times\text{ 1000000 = 200 ppm}[/tex]Why different bonds might have diffrent bond strengths
In a covalent bond, one pair of electrons, two and three can be shared. Forming single, double, or triple bonds. The more electron pairs are shared, the stronger the bond will be.
13. Choose the geologic formation that fits the description: the world's longest mountain chain.
The mid-ocean ridge would be the longest and largest mountainous region. With a circumference of 40,389 miles, it genuinely is a world landmark.
The water covers around 90% of the mid-ocean ridge system. The world is crisscrossed by a system of mountains as well as valleys that resembles the seams in a baseball. Tectonic plate movement on Earth is what creates it.
Mountain ranges like the Rockies had also often grown and fallen over the evolution of our planet. Whenever two continents clash, mountains are created. Due to their identical weight as well as diameter, neither plate would bury beneath the other.
In a process known as plate tectonics, sections of such Earth's mantle, known as plates, collide with one another as well as buckle up like such a rear bumper in a frontal collision to build the world's largest mountain ranges.
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how many molecules of p2o5 are there in 7.32 moles
In order to answer this question, we will need to Avogadro's number, which represents the number of atoms or molecules within 1 mol of a compound, this number is equal to 6.02*10^23 atoms or molecules, now we want to know how many molecules there are in 7.32 moles, we will do that by performing the following calculation:
1 mol = 6.02*10^23 molecules
7.32 moles = x molecules
x = 4.41*10^24 molecules
4 Which protective measure is 100 percent effective at reducing the risk of sexually transmitted disease? A. Use a condom during intercourse. B. Keep the number of partners to a minimum. C. Use birth control pills correctly. D. Abstain from sexual activity.
Which protective measure is 100 percent effective at reducing the risk of sexually transmitted disease is . and Abstain from sexual activity.
The protective measure is 100 percent effective at reducing the risk of sexually transmitted disease is only Abstain from sexual activity. The other methods that is keep number of partners to a minimum , use birth control pills correctly are for reducing risk for pregnancy. Use a condom during intercourse is reduce the risk for sexually transmitted disease but not 100 % effective.
Thus, Which protective measure is 100 percent effective at reducing the risk of sexually transmitted disease is Abstain from sexual activity.
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calculate the mass in g of CaCl2 required to make 230 mL of a 75% (w/v) CaCl2 solution
The concentration of CaCl₂ is 75 % W/V. This means 75 g of the solute in 100 ml solution. Therefore, mass of calcium chloride required in 230 ml of this solution is 172.5 g.
What is mass by volume percentage?Mass by volume percentage of a solute is term used to represent the concentration of the solution. % W/V of a solution is the mass of solute in grams per 100 ml of the solution.
It is given that the mass by volume percentage of the calcium chloride solution is 75% (w/v). Thus 75 g of calcium chloride is present in 100 ml of the solution.
Therefore, the mass of calcium chloride in 230 ml of this solution is calculated as follows:
mass of solute = (230 ml ×75 g) /100 ml
= 172.5 g
Hence, the mass of calcium chloride is 172.5 g.
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2.60 moles CO and 2.60 moles H2O are placed in a 2.00L container at 690 °C (Keg=10.0).Calculate all equilibrium concentrations in the following reaction:
Answer:
considering the information given, the concentrations at equilbrium are:
CO(g) = 1.30 M
H2O(g) = 1.30 M
CO2(g) = 4.11 M
H2(g) = 4.11 M
Explanation:
The question requires us to calculate the concentration of CO, H2O, CO2 and H2, given the following information:
- number of moles of CO = 2.60 mol
- number of moles of H2O = 2.60 mol
- volume of container = 2.00 L
- temperature = 690°C
- equilibrium constant = 10.0
- balanced chemical equation:
[tex]CO_{(g)}+H_2O_{(g)}\rightleftarrows CO_{2(g)}+H_{2(g)}[/tex]Since the number of moles of CO and H2O were provided, as well as the volume of the container, we can calculate the concentration of this gases in moles per liter:
[tex]\begin{gathered} [CO\rbrack=\frac{2.60mol}{2.00L}=1.30mol/L=1.30M \\ \\ [H_2O\rbrack=\frac{2.60mol}{2.00L}=1.30M \end{gathered}[/tex]Also, since we have the equilibrium constant for this reaction and the concetrations of CO2 and H2 at equilibrium will be the same (they have the same stoichiometric coefficient), we can calculate the concentration of the products using the expression for Keq.
First, let's write the Keq expression for this reaction:
[tex]K_{eq}=\frac{[CO_2\rbrack\times[H_2\rbrack}{[CO\rbrack\times[H_2O\rbrack}[/tex]Considering,
[CO2] = [H2] = x
and rearranging this equation to calculate x:
[tex]K_{eq}\times[CO\rbrack\times[H_2O\rbrack=x^2\rightarrow x=\sqrt[2]{K_{eq}\times[CO\rbrack\times[H_2O\rbrack}[/tex]Now, applying the value of Keq given by the question, and the values of concentration calculated previously, we'll have:
[tex]x=\sqrt[2]{10.0\times1.30M\times1.30M}\rightarrow x=4.11M^[/tex]Therefore, considering the information given, the concentrations at equilbrium are:
CO(g) = 1.30 M
H2O(g) = 1.30 M
CO2(g) = 4.11 M
H2(g) = 4.11 M
I don't know how to solve this. Thank you.An iron cube 20 cm on each side is completely submerged in water. If you have a mass of 5.60kg,Calculate the density of the block and the mass of water displaced (the density of water is 1000kg/m3).
a) Calculate the density of the block.
The density of any substance is defined as the mass divided the volume.
Density of the block = mass of the block/volume of the block.
We are given the mass of the block.
mass of the block = 5.60 kg
Since the it is an iron cube, we can find its volume.
Side = 20 cm = 0.20 m
Volume of the block = (side)³
Volume of the block = (20 cm)³ = (0.20 m)³
Volume of the block = 8000 cm³ = 0.008 m³
Now that we know the mass and the volume we can find the density of the block.
Density of the block = Mass of the block / Volume of the block
Density of the block = 5.60 kg / 8000 cm³
Density of the block = 0.0007 kg/cm³
Density of the block = 5.60 kg / 0.008 m³
Density of the block = 700 kg/m³
Answer: The density of the block is 0.0007 kg/cm³ or 700 kg/m³
b) Calculate the mass of water displaced:
If we consider that the cube is completely submerged (as the problem says) it will displace some water. How much water does it displace? Archimedes' says: "The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid". That means that the block completely submerged in water (fluid) will displace its volume of water.
volume of water displaced = volume of the block
volume of water displaced = 8000 cm³ = 0.008 m³
Now that we know the volume of water displaced, and since we are given the density of water, we can find the mass of water displaced.
Density of water = mass of water / volume of water
mass of water = volume of water * density of water
mass of water = 0.008 m³ * 1000 kg/m³
mass of water displaced = 8.0 kg
Answer: Supposing that the block is completely submerged it displaces 8.0 kg of water.
Why is the timing of tides predictable?
The Earth's global winds are predictable.
The Moon's orbit around Earth is predictable.
The ocean water's density is predictable.
The Earth's rotation on its tilted axis is predictable.
The timing of the tide is predictable by the moon's orbit around the earth is predictable
Tides are the periodic rise and fall of surface water caused by the gravitational force of the moon and sun, as well as the rotation of the earth. The movements of the solar system that influence the tides are predictable, so changes in tide height and time are predictable.
Tides can be predicted accurately and far in advance. Tides are caused by the orbital relationships between the Earth, the Moon, and the Sun. These relationships are well understood, and the positions of the celestial bodies can be predicted very accurately in the future.
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What is the molarity of a solution after 14.38 mL of 1.950 M NaCI solution is distilled into a total of 533.98 mL solution?
To answer this question we have to use the rule of dilutions:
[tex]C1V1=C2V2[/tex]Where C1 and C2 are the initial and final concentrations and V1 and V2 are the initial and final volumes, respectively. In this case we have to find C2 and the other values are given:
[tex]\begin{gathered} C2=\frac{C1V1}{V2} \\ C2=\frac{14.38mL\cdot1.950M}{533.98mL} \\ C2=0.052M \end{gathered}[/tex]It means that the answer is 0.052M.
At some temperature, an equilibrium mixture, in a 1.00-L container, involving the chemical system
PCl5(g) == PCl3(g) + Cl2(g)
is found to contain 2.01×1021 molecules of PCl5, 0.00377 mol of PCl3, and 0.519 g of Cl2.
Calculate the equilibrium constant (Keq expressed in terms of the molar concentrations) at this temperature.
The equilibrium constant Keq is the ratio of product of concentration of products in a reaction to that reactants. In the given reaction the equilibrium constant is 1.05 × 10²⁴.
What is equilibrium constant?The equilibrium constant in a reaction is the ratio of product of molar concentrations of products to the product of molar concentration of the reactants in the reaction.
In the given reaction, the product is PCl₅ and reactants are Cl₂ and PCl₃. Thus the expression for Keq is written as:
[tex]Keq = \frac{[PCl_{5}]}{[PCl_{3}][Cl_{2}]}[/tex]
Apply the number of moles and volume of all the reactants and products in this expression.
Keq = (2.01 × 10²¹molecules /1 L ) [(0.12/1L) (0.15/ 1L)]
= 1.05 × 10²⁴
Hence, the equilibrium constant Keq is 1.05 × 10²⁴.
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24. Predict the Products
a. Ca + H3N→
b. KF→
c. NaBr + MgO→
i,ii&iii only the alkanes forms 3-bromo-3-methylpentane as the major product when it's react with hbr.
What is alkane forms?
Alkanes are the series of a compounds that is contain carbon and hydrogen atoms of the with single covalently bonds. Theses are knowns as saturated if hydrocarbons. This group of the compounds consists of a carbon and hydrogen and atoms with single covalent bonds. Also it is comprises a homologous series of having a molecular formula of NaBr+MgO.
Sol-this problem which of the following Elkins yields three bromo three metal painting as the major product upon addition of HBR. So let me just write an equation right? I'm writing here directly. So when HBR is reacted, so what will be the compound here? We will be getting a compound like this. Alright, so this is B. R. Again, we are processing here with H beyond right.
This is it. So now organic compound is going to be seen. This is beard. Right? So here you can point one more when you add here it's B. R. We will be getting here. Yeah, again, for this when weird it's beard. So again we will be getting to come home like this. So same compound we're getting that means this is this is nothing but three Bromo three metal contains as the major product. So all are having the same product and option is all of them is correct. Right? No next question it is asked at which of the following cardboard signs bill undergo At 1 2 metal shift. Right? So None of them ever was the correct answer because none of them will undergo 12 m shift.
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Perform the followingmathematical operation, andreport the answer to thecorrect number of significantfigures.16.52 x 5.8 = [?]=Enter
For multiplication and division operations, we perform the operations normally, and the final result must be written with the same number of significant figures as the factor that has the fewest significant figures.
16.52 x 5.8 = 95.816
The result obtained in the above multiplication must be rounded to two significant figures, which correspond to the number of significant figures of the number 5.8. Therefore, we must round the result, giving as answer 96.
Answer: 96
What is the name of the molecule below?HHOA. MethaneOB. MetheneO C. EthyneOD. EtheneC=CHH
In this case, we have a two carbon molecule, the prefix for this type of molecule is Et
Since this compound has a double bond, the suffix will be ene
Therefore we have in this question, the molecule Ethene, letter D
Calculate the concentration of H3O + ions in a solution of NaoH whose concentration is 0.62M at 25 ° C.
The pH of this solution is 0.207
Hello
To solve this question, we need to use the formula of solving pH of a solution from hydrogen or hydronium ion.
[tex]\begin{gathered} pH=-\text{log\lbrack{}H}_3O^+\rbrack \\ \end{gathered}[/tex]Now, we would proceed to substitute the given value and solve for it.
[tex]\begin{gathered} pH=-\log \lbrack0.62\rbrack \\ pH=0.207 \end{gathered}[/tex]NB: we did not use the value of temperature because it is not needed in this solution.
From the calculation above, the pH of this solution is 0.207
A 0.19 mole sample of nitrogen gas occupies a volume of 2.25 L. What is the volume of 0.27 mol of nitrogen gas under the same conditions?
Step 1 - Discover the relation between moles and volume
The gas state equation states that:
[tex]pV=\text{nRT}[/tex]Since the exercise says that both pressure and temperature will remain the same ("under the same conditions"), and R is already a constant, we can obtain a direct relation between moles and volume:
[tex]V=n(\frac{RT}{P})\rightarrow V\propto n[/tex]Since R, T and P will not vary, the quocient in parenthesis is a constant. Therefore, the volume will be directly proportional to the number of moles of gas.
Step 2 - using the relation to solve the problem
Since, as we saw, volume and moles are directly proportional to each other, we can set the following proportion to discover the new volume:
[tex]\begin{gathered} 0.19\text{ moles of N2----2.25 L} \\ 0.27\text{ moles of N2-----x} \\ \\ x=\frac{0.27\times2.25}{0.19}=3.19\text{ L} \end{gathered}[/tex]So, the volume of 0.27 moles of N2 gas, under the same conditions, will be 3.19 L.
How much motion energy does an 0.5-kg hockey puck sliding across the ice rink at 4 m/s have?
Answer:
A hockey puck is given an initial speed of 5.3 m/s . If the coefficient of kinetic friction between the puck and the ice is 0.05, how far does the puck slide before coming to rest? Solve this problem using conservation of energy.
Explanation:
This is easy to do and it is very cool how it works.
Force here is what converts the kinetic energy to heat by friction and slows the puck
fu = coefficient of Kinetic friction
g = is the acceleration of gravity
Fu*g = a.
So friction force on the puck is the acceleration of gravity times the coefficient of kinetic friction and the acceleration force is made negative here because it is slowing down the puck. .
Puck friction to negative acceleration
fu=0.05
g = -9.81m/s^2
so
a = 0.05 * -9.81m/s^2 = -0.4905 m/s^2
For the moving puck
Velocity = v = u + (a*t) | u=initial velocity
So
Time = t = (v-u)/a
Distance = d = t *(v + u)/2
So
Distance d= ((v-u)/a) * ((v+u)/2)
This becomes d = (v-u)(v+u)/2a
Plugging in the numbers
d= (0 - 5.3)(0 + 5.3)/(2*-0.49.5) =28.63 meters
I need assistance on number 5 including all parts of number 5 thank you !
5a) Propyne is a member of the alkyne group with the formula C3H4. The compound consists of 3 carbon atoms and 4 hydrogen atoms. The expanded form of the compound is as shown below;
b) For the skeletal structure of 2, 2 - dimethyl butane, the carbon and hydrogen atoms are hidden. The structure will only be written in form of lines as shown:
c) The molecular formula for benzene is C6H6. It is cyclic in nature with a total of 6 carbon atoms and 6 hydrogen atoms. The structure of the atom is as shown below;
d) Heptane is an alkane compound with the molecular formula C7H16. The condensed formula do not contain any lines or angles. They are written in term of their hydrogen and carbon compounds.
[tex]CH_3CH_2CH_2CH_2CH_2CH_2CH_3[/tex]Agas is contained in a thick-walledballoon. When the pressure changesfrom 100 kPa to 90.0 kPa, thevolume changes from 2.50 L to3.75 L and the temperature changesfrom 303 K toK.
In this question, we have a situation where all 3 known gas laws are being used in what is called the Combined gas law, and the formula for this law is:
P1V1/T1 = P2V2/T2
We have:
P1 = 100 kPa, or 0.987 atm
V1 = 2.50 Lites
T1 = 303 K
P2 = 90 kPa, or 0.888 atm
V2 = 3.75 L
T2 = ?
Now we add these values into the formula:
0.987 * 2.50/303 = 0.888 * 3.75/T2
2.47/303 = 3.33/T2
0.00815 = 3.33/T2
T2 = 408 K is the new temperature
what is the logic behind drawing lewis fomrulas for like harder and weird compounds like how can you figure it out easy.harder compounds like ch3och3
Answer:
The logic behind drawing Lewis formulas is to use the valence electrons of the elements and complete the Octet rule.
Explanation:
The logic behind drawing Lewis formulas is to use the valence electrons of the elements and complete the Octet rule.
Valence electrons are the electrons of an atom that are located in the last shell. We represent the valence electrons using dots between covalent bonds.
The Octet rule says that an element loses or gains electrons in order to achieve the electron configuration of the nearest noble gas, it means that it will try to have 8 electrons in the last shell.
For example: CH3OCH3
1st) It is necessary to find the total number of valence electrons. We can find the electrons of valence of each atom in the Periodic Table, and then we have to multiply it by the number of atoms in the molecule:
- Total number of valence electrons of C: 4e * 2 = 8e
- Total number of valence electrons of H: 1e * 6 = 6e
- Total number of valence electrons of O: 6e * 1 = 6e
Total number of valence electrons of CH3OCH3 = 20e (8 + 6 + 6 = 20)
2nd) Now we have to start drawing with the least electronegative atom in the center. In this case, we have to draw the O in the center (even though it is not the least electronegative atom in the molecule), because it is the only one that has only 1 atom in this molecule, and hydrogen atoms always go on the outside:
We have to start drawing the electrons, trying to complete the octets on the outside atoms, in this case, hydrogen, then carbon, and finally oxygen.
Hydrogen atom only needs 2 valence electrons to complete the last sheel.
Select the correct answer from each drop-down menu. How can you reduce air pollution arising from transportation?
Explanation:
When using public transport vehicles instead of private cars, we emit less pollution. For example in a bus more than 20 people travel, so the pollution per person is lower.
When we increase speed we usually consume more fuel, so avoiding accelerating rapidly we also reduce pollution.
Answer:
a) public transport vehicles.
b) accelerating rapidly.
Iron (III) oxide reacts with Carbon to form Iron and Carbon monoxide. How many moles of Iron can be formed from 125 KILOGRAMS of Iron (III) oxide?
For the complete reaction of 130 ml 0.140 mole ,130 ml of 0.14 moles is required.
What is moles?
mole Is the unit of amount of substance in the international system of unit.
For the complete reaction of 130 ml 0.140 M CO (NO3)2, 130 ml of 0.14 is required.
The reaction of Li2S with CO(NO3)2 will be:
Li2S +CO(NO3)2-->2LiNO3+COS
Accordingly, 1 mole of Li2S completely reacts with 1 mole of CO(NO3)2.
moles of CO(NO3)2 - Molarity Volume (L)
moles of = 0.140 M × 0.13 L
moles of CO(NO3)2 = 0.0182 moles.
The moles of Li2S reacts with CO(NO3)2 will be 0.0182 moles.
Volume of = Li2S= moles/molarity
Volume of = Li2S 0.0182/0.140
Volume of Li2S = 0.13 L
Volume of Li2S = 130 ml.
For the complete reaction of 130 ml 0.140 M , 130 ml of 0.14 is required.
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Write 5 sentences about voltaic cells.
ANSWER
EXPLANATION
Voltaic cell is a type of an electrochemical cell that uses chemical reaction to generate electrical energy
In voltaic cell, the oxidation process occur at the anode while reduction processes occur at the cathode.
You have 2.7 x10^24 particles of C3H8:. How many grams are present?
Step 1 - Understanding molar mass
As we have previously seen, one mole corresponds to 6*10^23 particles.
When we weight one mole of something, we obtain what is called the molar mass: the mass of one mole of particles.
Each element has his own molar mass, which can be found in the periodic table. We can use them to calculate the molar mass of a molecule.
Let's see an example. Water is H2O. Looking at a periodic table, we find the molar masses 1 g/mol for H and 16 g/mol for O. Therefore, the molar mass of water will be:
[tex]M_{H2O}\rightarrow2H+1O=2\times1+1\times16=18\text{ g/mol}[/tex]Which means that 1 mole of water weights 18g.
Step 2 - Solving the exercise
Let's start by calculating the molar mass of C3H8. The molar mass for C is 12 g/molj, so:
[tex]M_{C3H8}=3C+8H=3\times12+8\times1=44\text{ g/mol}[/tex]44g corresponds thus to one mol of C3H8. Since one mole is 6.10^23 particles, we can set the following proportion:
[tex]\begin{gathered} 6.10^{23^\text{ }}particles\text{ of C3H8 ------ 44g} \\ 2.7\times10^{24}\text{ particles of C3H8 ----- x} \\ \\ x=\frac{2.7\times10^{24}\times44}{6.10^{23}}=\frac{1188}{6}=198g \\ \end{gathered}[/tex]Answer: 198g of C3H8 are present.
write the chemical structure of 2 ethyl pentanoic acid
Hope this answer helps you
If Mr. Ken used 1.8 moles of sodium in the chemical reaction how many grams of sodium would he have used
We can always convert mass (g) to moles by using the molar mass of the substance, which can be found in the periodic table. In this case, we will use the molar mass of sodium (Na), which is 23g/mole, i.e., each 23g of sodium corresponds to 1 mole.
Since we want to find the mass of 1.8 moles of Na, we can set the following proportion:
[tex]\begin{gathered} 23g\text{ of Na ----- 1 mole} \\ x\text{g of Na ------ 1.8 moles} \\ \\ x=\frac{1.8\times23}{1}=41.4g \end{gathered}[/tex]So, by using 1.8 moles of Na, we are using 41.4 g of sodium (Na).