Considering the ideal gas law, the pressure in a 7.00 L tank with 1.73 grams of hydrogen gas at 375 K is 26.5987 atm.
Definition of ideal gas lawAn ideal gas is called a hypothetical or theoretical gas, which would be composed of particles that move randomly and without interacting with each other.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar gas constant:
P×V = n×R×T
Pressure in this caseIn this case, you know:
P= ?V= 7 Lmass of hydrogen= 1.73 gmolar mass of hydrogen= 1 g/molen= mass of hydrogen× molar mass of hydrogen= 1.73 g÷ 1 g/mole= 1.73 molesR= 0.082 atmL/molKT= 375 KReplacing in the definition of ideal gas law:
P× 2 L = 1.73 moles ×0.082 atmL/molK ×375 K
Solving:
P= (1.73 moles ×0.082 atmL/molK ×375 K)÷ 2 L
P= 26.5987 atm
Finally, the pressure is 26.5987 atm.
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Moles and mass and help with ratios eg 3:4 3:7
The balanced equation is:
[tex]Mg_{(s)}+H_2O_{(g)}\to MgO_{(s)}+H_{2(g)}[/tex]The first step is to convert the given mass of magnesium to moles (MW=24.3g/mol):
[tex]1g\cdot\frac{1mol}{24.3g}=0.04mol[/tex]Now, use the ratio given by the chemical equation:
[tex]0.04molMg\cdot\frac{1molMgO}{1molMg}=0.04molMgO[/tex]Now, use the molecular weight of magnesium oxide to convert it to grams (MW=40.3g/mol):
[tex]0.04mol\cdot\frac{40.3g}{1mol}=1.612g[/tex]The maximum mass of magnesium oxide produced is 1.612g.
Which property of water helps it maintain a relatively stable temperature? aHigh specific heat capacity bLow density cNeutral nature dNonpolar structure
Water property:
Water can moderate its temperature because of 2 properties: high specific heat and the high heat of vaporization.
High specific heat is the amount of energy that is absorbed or lost by one gram of a substance to change the temperature by 1 degree Celcius.
--------------------
Water's high specific heat allows it to absorb a large amount of heat without changing much in temperature, keeping a relatively constant temperature.
Answer: a High specific heat capacity
Which describe anions? (Mark ALL the correct answers.)
metals
nonmetals
positive charge
negative charge
more electrons than protons
more protons than electrons
Answer: nonmetals, negative charge, more electrons than protons
Explanation:
Balance the chemical equation using the smallest possible whole number stoichiometric coefficients
To balance a chemical equation, we have to take into account the coefficients and subscripts that indicate us the number of atoms of each element.
The first element we are going to balance is sodium, in the reactants, there is only one atom and in the products there two atoms of Na, so we have to assign 4 as the coefficient of NaOH and 2 as the coefficient of Na2HPO3.
There are 4 atoms of phosphorus in the reactants and 3 of them in the products. To balance it assign 2 as the coefficient of PH3.
Finally, balance the number of oxygens and hydrogens in the equation. There are 5 atoms of oxygen in the reactans and 6 of them in the products. Assign 2 as the coefficient of H2O, at this points, all the elements are balanced.
The balanced equation is:
[tex]P_4+4NaOH+2H_2O\to2PH_3+2Na_2HPO_3[/tex]Sodium fluoride is added to many municipal water supplies to reduce tooth decay. Calculate the pH of a 0.00339 M solution of NaF. Ka for HF is 6.8 x 10^-4.
The pH of 0.00339 M solution of NaF when Ka for HF is 6.8 x 10^-4 is 7.34
In this case, it is the base, F-. A reaction table for base ionization, which is the reaction of a base with water:
F- + H2O <===> HF + OH-
Kb = [OH-][HF] / [F-]
Ka = 6.8 x 10-4
Kb = 1.47 x 10-11
1.47 x 10-11 = [x] [x] / 0.00339-x = [x] [x] / 0.00339 ( x << than 0.00339 M due to the small Kb)
x = 2.23 x 10-7
pOH = 6.65
pH = 14-6.65 = 7.34
pH = 7.34
The pH is 7.34
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What is the pH of a 10^-4 M HCl solution?Answers to choose:•1•2•3•4
Hydrochloric acid is a strong acid. This means that in a solution all the H+ ions will be released. Also, one mole of HCl has one hydrogen atom, so we can assume that the concentration of HCl is equal to the concentration of H+ ions.
On the other hand, the definition of pH tells us:
[tex]pH=-log\lbrack H^+\rbrack[/tex]Where [H+] is the ions H+ concentration.
H+ concentration is 10^-4M. If we replace in the equation we will have:
[tex]\begin{gathered} pH=-log10^{-4}M=4 \\ pH=4 \end{gathered}[/tex]answer: The pH of the solution is 4
Name the type of reaction below:
CuSO4*5H2O → CuSO4 + H2O
CuSO4 + 5H2O → CuSO4 + H2O In this reaction addition of water takes place therefore this is a hydration reaction.
What is hydration ?A chemical event called hydration occurs when two substances interact with water. Water is added to an unsaturated substrate in organic chemistry, which is often an alkene or an alkyne. The industrial production of ethanol, isopropanol, and butan-2-ol uses this sort of reaction.
Alkenes are often hydrated to produce alcohol, which is one of the most frequent hydration reactions.
While copper cannot conduct a displacement reaction with water, it may produce copper complexes through a redox/electrochemical reaction with water, oxygen.
Thus, this is hydration reaction.
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How diborane is prepared? write the reaction for the preparation of diborane
[tex]{ \underline{ \red{ \sf{preparation \: f \: diborane}}}}[/tex]
Diborane is prepared by the reduction of boron trichloride with lithium aluminium hydride.
[tex]{ \blue{ \sf{4BF3 + 3LiAlH4 → 2B2H6 + 3AlF3 + 3LiF}}}[/tex]
It can be also prepared by reducing trifluoride with sodium hydride at 180°C.
[tex]{ \red{ \tt{2BF3 + 6NaH \: —(180°C)→ \: B2H6 + 6NaF}}}[/tex]
If you need 300g of NH3 how many liters of N2 are required? N2+3H2=2NH3
Answer:
197.12L of N2 are required.
Explanation:
1st) From the balanced reaction we know that 1 mol of N2 reacts with 3 moles of H2 to produce 2 moles of NH3.
2nd) It is necessary to convert moles to grams with the molar mass, and use the stoichiometry of the balanced reaction to find the amount of N2 moles that are required to produce 300g of NH3:
- N2 molar mass: 28g/mol
- NH3 molar mass: 17.01g/mol
[tex]300gNH_3*\frac{1mol}{17.01g}=17.64mol[/tex]300g of NH3 is equal to 17.64 moles of NH3.
3rd) Now, with a mathematical rule of three we can find the moles of N2 that are required to produce 17.64 moles of NH3:
[tex]\begin{gathered} 2molesNH_3-1molN_2 \\ 17.64molesNH_3-x=\frac{17.64molesNH_3*1molN_2}{2molesNH_3} \\ x=8.82molN_2 \end{gathered}[/tex]Now we know that 8.82 moles of N2 are needed.
4th) Finally, using the molar volume value (22.4L), we can calculate the liters of N2 that are required.
The molar volume indicates that 1 mole is equivalent to a volume of 22.4L under normal conditions.
[tex]8.80mol*\frac{22.4L}{1mol}=197.12L[/tex]So, 197.12L of N2 are required.
How many atoms does PbNO3 has?
Answer: 7 atoms
Explanation:
Answer:
5 atoms
Explanation:
Pb= 1 atom
N = 1 atom
O = 3 atoms
Thus, total no. of atoms are 5
What formula for a molecule formed from P and Cl would be? PCl 5 PCl 2 P 3Cl PCl PCl 3
The question requires us to identify the molecular formula of a molecule formed between phosphorus (P) and chlorine (Cl).
The first step to solve this question is write the electronic configuration of both atoms involved (P and Cl) and, from the number of valence electrons, identify how many bonds each one should make.
P has atomic number 15, thus its electronic configuration is: 1s2 2s2 2p6 3s2 3p3
Cl has atomic number 17, thus its electronic configuration is: 1s2 2s2 2p6 3s2 3p5
Note that P has 5 valence electrons (3s2 and 3p3) while Cl has 7 valence electrons (3s2 3p5).
For P, we should expect 3 bonds to other atoms in order to reach the octet, while for Cl, we should expect 1 bond to another atom to achieve the octet.
With that in mind, we can say that each Cl will bond to one P, and we need 3 Cl. Therefore, the molecular formular is PCl3 (the last option).I
How many grams are in 3.25 mol of Carbon?
Explanation:
To solve this question we use the following formula:
m = n*MM
m = mass
n = moles
MM = molar mass
MM of carbon s 12 g/mol
so:
m = 3.25*12
m = 39 g
Answer: 39 g
Select all correct statements dealing with electron affinity. a) In general the first electron affinity is: X(g) → X+(g) + e-b) It is the enthalpy change associated with the addition of an electron to a gaseous atom or ion.c) It is the enthalpy change associated with the removal of an electron from a gaseous atom or ion.d) In general the first electron affinity is: X(g) + e- → X-(g)
Option C and D are correct.
Explanations:What is electron affinity?Electron affinity is dfined as the energy required to remove en electron from a gaseous atom or molecule. An example of a gaseous atom loosing an electron is given as:
[tex]X(g)+e^-\rightarrow X^-(g)[/tex]From the reaction, you can see that the gaseous element X looses an electron from its outershell to form an ion. This reaction is known as the first electron affinity.
Hence the correct statement dealing with electron affinity are:
• It is the enthalpy change associated with the, removal of an electron, from a gaseous atom or ion.
• In general the, first electron affinity, is:, X(g) + e- → X-(g)
The component of a solution that is present in the greatest amount is:Group of answer choicesSoluteWaterSolventSalt
Step 1 - Understanding what is a solution
A solution is a homogeneous mixture consisting of two or more substances: one solvent and two or more solutes. Even though water is the commonest of all solvents, it is not the only one. Alcohol can be a solvent as well, for example.
The solvent is usually defined as the substance present in the greatest amount.
Step 2 - Answering the question
The correct answer is item c) solvent, since the solvent is usually present in the greatest amount.
What is the mass in grams of 5.024x23 platinum atoms?
162.75 g
So 1 mol of Pt contains 195.08 g, and 1 mol = 6.022*10^23 atoms, so when you do the math, you will have the value of 162.75 g of mass
6.022*10^23 = 195.08 g
5.024*10^23 = x grams
6.022*10^23x = 980.08
x = 980.08/6.022*10^23
x = 162.75 g
Calculate the molarity of a solution that contains 15.7 g of CaCO3 dissolved in enough water to make 275 mL of solution. (MW: CaCO3=100.09 g/mol
We can find molarity using the following equation:
In this problem, our solute is CaCO3, and we have 15.7 g of it. To express this amount in moles, what we do is to divide by the molar weight of CaCO3. (Always that you want to pass from grams to moles you do this, just to divide the amount that you have by the molar weight of the substance).
This is:
Now, we have 275mL of solution and this is 0.275L of solution. (To pass from mL to L we just divide by 1000).
Finally, replacing in the formula to find molarity, we have:
The answer is 0.57M.
7. Which is the best description of when water boils?a. It is when the vapor pressure of water equals the surrounding atmospheric pressure.b. It is when the first bubble appears in a sample that is being heated.c. It is when bubbles are continually forming in a sample that is being heated.d. It is when the temperature of the water reaches 100 °C.
The alternative b is not a good description because you can form bubles without the water being boiling yet.
Also, alternative c is also not a good option because it is just a description of what is being seen, it could be replicated in other ways.
Alternative d only gives a termperature, and the boiling temperature can change depending on other conditions.
The alternative the best describes is alternative A.
What is the mole fraction of a solute in solution?
The mole fraction of a solute is the ratio of the number of moles of that solute to the total number of moles of the solution.
mole fraction of A = moles of A / total number of moles.
Perform the followingmathematical operation, andreport the answer to theappropriate number ofsignificant figures.7.55 + 17.002 = [ ?=
7.55 + 17.002 = ?
First, we have to determine the number of significant figures that each number has.
7.55: 3 SF and 2 SF after the decimal point.
17.002: 5 SF and 3 SF after the decial point.
Second, perform the mathematical operation as we usually do.
7.55 + 17.002 = 24.552
Finally we determine the correct number of SF. When adding or substracting the rule says: "The final answer may have no more SF after the decimal point than the least number of significant figures in the operation". Since 7.55 has 2 SF after the decimal point, we must round the result of the addition to the second place to the right of the decimal point.
Rounding 24.552 we get 24.55.
Answer: 24.55
What will be the final temperature of a 496−g sample of water, initially at 17.0°C, after 74.2 kJ have been added to it?
The final temperature of a 496−g sample of water, initially at 17.0°C, after 74.2 kJ have been added to it is 52.61°C.
Given,
Mass of sample water, m = 496g
Initial temperature of the water, t1 = 17°C
Heat added to the water, Q = 74.2 kj = 74200 kj
The quantity of the heat which is added in water to cause a change in the state of the sample water can be given as
Q = mc∆t
where
c is given as specific heat capacity of water = 4200J/kg°C
∆t = change in temperature of the water
The change in temperature of the water after adding heat is given as
∆t = Q/ mc
By substituting all the values, we get
= 74200/ 0.496 × 4200
= 35.61°C
Thus, from the calculated data we get the value of final temperature
change in temperature = Final temperature - initial temperature
Final temperature = 35.61 + 17 = 52.61°C
Thus, we concluded that the final temperature of a 496−g sample of water, initially at 17.0°C, after 74.2 kJ have been added to it is 52.61°C.
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If the following solutions are mixed, is the resulting solution acidic, basic, or neutral?60.0 mL of 0.0500 M HClO4 and 40.0 mL of 0.0750 M NaOH
Answer
The resulting solution will be neutral.
Explanation
Given:
Volume of HClO4 = 60.0 mL = 0.06 L
Molarity of HClO4 = 0.0500 M
Volume of NaOH = 40.0 mL = 0.04 L
Molarity of NaOH = 0.0750 M
What to find:
To determine if the resulting solution from (HClO4 and NaOH) acidic, basic, or neutral.
Solution;
The first step is to write a balanced chemical equation for the reaction.
HClO4 + NaOH → NaClO4 + H2O
The reaction is a neutralization reaction (also a double displacement reaction). The strong acid (HClO4) and a strong base react to produce salt (NaClO4) and water (H2O).
The next step is to determine the moles of the acid and the base using the formula below:
[tex]\begin{gathered} Moles=Molarity\times Volume\text{ }in\text{ }L \\ \\ For\text{ }HClO_4: \\ \\ Moles=0.0500M\times0.06L=0.003\text{ }mol \\ \\ For\text{ }NaOH: \\ \\ Moles=0.0750M\times0.04L=0.003\text{ }mol \end{gathered}[/tex]From the balanced chemical equation, 1 mol HClO4 neutralized 1 mol NaOH.
Therefore, 0.003 mol HClO4 will completely neutralize 0.003 mol NaOH and the resulting solution will be neutral.
Find the pH of the following solutions and tell if they are acidic, basic or neutral. [OH-] = 1.0 x 10-2M[OH-] = 1.0 x 10-11M[OH-] = 3.5 x 10-2M[OH-] = 4.4 x 10-11
In this question, we have to find the pH of 4 solutions with the given OH- concentration, and in order to do that, we have to find the pOH first, and then we can find the pH, the formula for pOH is the same as pH:
pOH = -log [OH-]
Solution 1:
pOH = -log [1.0*10^-2]
pOH = 2
pH + pOH = 14
pH = 14 - 2
pH = 12, this is a BASIC solution
Solution 2:
pOH = -log [1.0*10^-11]
pOH = 11
pH + pOH = 14
pH = 14 - 11
pH = 3, this is an ACIDIC solution
Solution 3:
pOH = -log [3.5*10^-2]
pOH = 1.45
pH + pOH = 14
pH = 14 - 1.45
pH = 12.55, this is a BASIC solution
Solution 4:
pOH = -log [4.4*10^-11]
pOH = 10.36
pH + pOH = 14
pH = 14 - 10.36
pH = 3.64, this is an ACIDIC solution
Given is a table: 3 alcohols and 3 diols - attached. What is the difference between the structure of an alcohol and diol in the same row of the table?
Explanation:
Structurally alcohols are alkanes with one H atom replaced by an -OH group. The main difference with diols is that they have two alcohol groups.
If we take for example the first row. The alcohol has 4 atoms of carbon, so its name is 1-butanol. In the same row, we are given a diol that only has 3 atoms of C (one less). Its name is 1,3-propanediol.
If we consider all the rows we will see that the main difference between the structures that we are given is that in each diol one atom of C is replaced by an alcohol group (-OH).
Answer: the main difference between the structures that we are given is that in each diol one atom of C is replaced by an alcohol group (-OH).
6.02 x 10^23 atoms of magnesium to moles
Answer:
[tex]1\text{ mole}[/tex]Explanation;
Here, we want to get the number of moles in the given number of atoms
Mathematically:
[tex]1\text{ mole = 6.02 }\times\text{ 10}^{23}\text{ atoms}[/tex]The number of moles in the given number of atoms is thus:
[tex]\frac{6.02\times10^{23}\text{ atoms}}{1}\text{ }\times\frac{1\text{ mole}}{6.02\times10^{23}\text{ atoms}}\text{ = 1 mole}[/tex]3. Make a claim as to why the leading cause of residential fires is not the leading cause of residential fire deaths.4. What percentage of fires are intentionally set? Why might someone intentionally set a fire?5. Do you think there would be more structural fires in the summer or winter? Explain your answer.
3. The leading cause of residencial fires (cooking equipment) is not the leading cause of residential death because the fire in the equipment can be extinguished in time, while the effects of smoking can remain unsigned in time.
4. The percentage of intentionally set fires is 8%. Someone might intentionally set a fire for example by burning yard trimmings.
5. There would be more structural fires in summer due to the high temperatures and the lack of rain.
A flask containing 100 g of water is heated, and the temperature of the water increases from 21°C to 90°C. How much heat did the water absorb if thespecific heat capacity of water is 4.184 J/gºC? A. 289 JB. 418.4 JC. 28,870 JD. 10,000 J
The heat absorbed by the water is if the specific heat capacity of water is 4.184 J/g°C c)28,870J
It is given that the mass of water is 100g and temperature T₁ increases from 21°C to T₂ 90°C. The specific heat capacity of water(c) is 4.184g°C. To find the heat absorbed by the water, the following formula is used:
q = mcΔT
where, ΔT = T₂ - T₁
ΔT = 90 - 21
ΔT= 69°C.
Therefore, by substituting the values to the formula, we get the heat q as
q = 100x4.184x69
q = 418x69
q = 28870J
Therefore the heat absorbed by the water if the specific heat capacity of water is 4.184 J/g°C is 28,870J. Therefore the correct option is c)
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What mass of iron is contained in 86.6 grams of chalcopyrite, CuFeS2?
Answer:
26.428 gm
Explanation:
molecular mass of CuFeS2 = 63.5+(2*32)+56 = 183.5 gm
Now we apply unitary method,
183.5 gm Chalcopyrite contains 56 gm Fe
∴ 86.6 gm Chalcopyrite contains [tex]\frac{56}{183.5} X 86.6[/tex]
= 26.428 gm Fe
Chemistry Molarity (measuring the concentration of a solution) - Correct the Question
1) Molar concentration (Molarity). This concentration unit tells us the amount a solute per unit of volume.
[tex]M=\frac{n}{v}[/tex]M: Molar concentration
n: moles of solute
v: liters of solution
Mr. Orlin is incorrect because he used grams instead of moles.
2) Calculating the molarity of the solution
Convert grams of FeCl2 to moles
The molar mass of FeCl2 is 126.75 g/mol
[tex]mol_{}FeCl_2=200gFeCl_2\cdot\frac{1molFeCl_2}{126.75gFeCl_2}=1.578molFeCl_2[/tex]Plug in known values
[tex]M=\frac{1.578molFeCl_2}{0.45L}=3.507MFeCl_2[/tex]The concentration of a 0.45 L solution containing 200 g of iron (II) chloride is 3.507 M FeCl2.
.
What NaCl concentration results when 244 mL of a 0.750 M NaCl solution is mixed with 437 mL of a 0.390 M NaCl solution?
0.518 mol L⁻¹ NaCl concentration results when 244 mL of a 0.750 M NaCl solution is mixed with 437 mL of a 0.390M NaCl solution.
Moles of NaCl in 244ml = 244* 10⁻³L * 0.750 mol L⁻¹
= 183 * 10⁻³ mol
Moles of NaCl in 437ml = 437*10⁻³L * 0.390 mol L⁻¹
=170.43* 10⁻³ mol
Since we must consider the volumes to be additive when these solutions are mixed, we have the following concentration with respect to NaCl
Concentration = ( 0.183+ 0.170)mol/ (244+437)*10⁻³L
= 0.353 mol/681*10⁻³
= 0.518 mol L⁻¹
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A 12 oz can of Red Bull contains 102 mg of caffeine (C8H10N4O2) (a) Determine how many molecules of caffeine are in the can(b) how many moles of caffeine are in the can?
3.16×10^23 molecules and 0.52 moles of caffeine are in the can.
given mass of caffeine=102 mg
molecular mass of caffeine=194.20 amu
moles=given mass/molecular mass
moles=102 mg/194.20 amu
moles= 0.52 mol
molecules = moles × avogadro number
molecules =0.52 mol× 6.022× 10^23
molecules=3.16×10^23 molecules
The mole signifies 6.02214076× 10^23 units, which is a very big quantity. The mole for the International System of Units is this quantity, according to the General Conference on Weights and Measures.
Every material has the same amount of atoms or other particles in a mole. The mole has the following relationship to an element's mass: One mole of carbon-12 atoms weighs 12 grams and has 6.02214076× 10^23 atoms.
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