A sample of liquid ethanol is added to a sealed glass beaker.A sealed beaker contains liquid ethanol, represented as circles. Most of the circles are in the liquid, but a few are in the space above the liquid.Figure © 2019 StrongMindBeaker: BlueRingMedia/ShutterstockWhat will happen to the ethanol after a minute?

Step 1 - Understanding how mole relates to temperature, pressure and volume

These variables are related according to the ideal gas equation:

We can use this equation to predict the behavior as well as the quantity of a gas, given that the remaining variables are given.

Step 2 - Using the equation to solve the equation

According to the exercise:

Setting the values in the equation:

We need to make two observations now: the temperature must be in Kelvin in this equation for it to work. R stands for the universal gas constant, as has the value of 0.082 atm.L/mol.K.

Therefore:

Answer: the amount of moles used is 0.17 moles.

To know the empirical formula we will determine how many moles of each element we have. To do this, we must look up in the periodic table the atomic weight of each element.

The atomic weight of Ni = 58.6934 g/mol

O = 15.999 g/mol

Now we divide the mass of each element by its atomic weight to determine how many moles are in the sample.

In the sample, there are 0.036 moles of oxygen and 0.036 moles of Ni. The ratio is 1 to 1, so the empirical formula will be: NiO

The molarity of a solution that contains 0.75 mol of KCI in 0.250L of the solution is 3 M

The number of moles per liter of solution is termed molarity.

M=n/V(in L)

M is the molarity

n is the number of moles

V is the volume

Substituting the values, we get

M=0.75/0.25=3

The molarity is 3 M

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Answer: There are 0.375 moles of neon gas present in the testing chamber.

Explanation:

The question requires us to calculate the number of moles of neon gas, given that the gas is in a 2.50 L chamber at 325.0 K and the pressure inside the chamber is 4.00 atm.

We can solve this problem using the equation for ideal gases, as shown below:

where P is the pressure of the gas (P = 4.00 atm), V is the volume of the gas (V = 2.50 L), n is the number of moles, that we want to calculate, T is the temperature of the gas (T = 325.0 K) and R is the gas constant.

Note that the values of pressure and volume are given in atm and L, respectively. Therefore, we can apply the gas constant in units of L.atm/mol.K:

R = 0.082057 L.atm/K.mol

First, let's rearrange the equation of ideal gases in order to calculate the number of moles of gas:

Now, applying the values given by the question and the constant R, we'll have:

Therefore, there are 0.375 moles of neon gas in the testing chamber under the conditions given by the question.

The balanced half-reaction is Fe²⁺ + 2e⁻ --------> FeO₄²⁻

The given reaction is a redox reaction. Balancing a redox reaction is a bit different than solving a normal chemical reaction. The first step is to find the oxidation state of each element in the reactant as well as the product side. By doing so we get,

The oxidation state of Fe - +2

On the product side, we get,

The oxidation state of Fe - +6

The oxidation state of O - -2

The next step is to calculate the difference between the oxidation states.

The difference in oxidation state of Fe - +6 - (+2) = +4

The difference in oxidation state of O - 0 -2 = -2

To balance this reaction, 2 electrons should be added to the reactant side so that the oxidation states of O and Fe get balanced equally. By doing so we get,

Fe²⁺ + 2e⁻ --------> FeO₄²⁻

This is a balanced half-reaction in acid

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A single bond is made up of 1.0 sigma bond and no pi bonds.

Pi bonds appears from double bonds onwards.

Answer

The mass of oxygen needed to burn 54.0g of butane is 193.24 g

Explanation

Given:

Mass of butane = 54.0 g

What to find:

The mass of oxygen needed to burn 54.0g of butane.

Step-by-step solution:

Step 1: Write the balanced chemical equation for the reaction.

2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O

Step 2: Convert 54.0 g of butane to moles

Molar mass of C₄H₁₀ = 58.12 g/mol

Step 3: Use the mole ratio in step one and the mole of C₄H₁₀ in step 2 to calculate the mole of oxygen.

Step 4: Convert the moles of O₂ in step 3 to mass in grams.

Molar mass of O₂ = 31.998 g/mol

Hence, the mass of oxygen needed to burn 54.0g of butane is 193.24 g

Step 1

Torr and kPa are units of pressure

---------

Step 2

The equivalence:

760 torr = 101325 Pa

1 kPa = 1000 Pa

Procedure:

960 Torr x (101325 Pa/760 Torr) = 127989.47 Pa

Then, 127989.47 Pa x (1 kPa/1000 Pa) = 128 kPa approx.

Answer: Pressure = 128 kPa

Given the reaction:

We're going to write a net ionic equation for this reaction as follows:

1. First, write the total ionic equation:

2. Now, we could cancel the same type of ions that are in both sides of the reaction. Therefore, the net ionic equation is:

The final volume of the balloon if 0.20 moles of gas are added will be 1.62 L.

The volume of the balloon given that 0.20 moles of a gas is added to it is determined using the ideal gas equation as follows:

P₁V = nRT

Where;

Initial volume, V₁ = 1.50 L

Initial mole of gas, n₁ = 2.50 mol

Initial temperature, T₁= 25°C or 298 K

Initial pressure, P₁ = RT₁n₁/V₁

P₁ = 0.082 * 298 * 2.50 /1.50

P₁ = 40.7 atm

With pressure and temperature held constant:

Final temperature, T₂ is equal to T₁ = 298 K

Final pressure, P₂ is equal to P₁ = 40.7 atm

Final moles of gas, n₂ = 0.20 + 2.5

n₂ = 2.70 mol

Final volume, V₂ = RT₂n₂/P₂

V₂ =  0.082 * 298 * 2.70 /40.7

V₂ = 1.62 L

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The formulas and and  the names for 5 possible ionic compounds involving these ions are :

Rb₂O, Rubidium Oxide

FeCl₂, Iron(II)chloride

Al(OH)₃ , Aluminum hydroxide

LiH, Lithium Hydride

NaCl, Sodium chloride

1) The  Rb₂O is called as Rubidium oxide. rubidium oxide is an ionic compound. Ionic compound formed between a positive ion called cation and a negative ion called anion . ionic bond is formed with the complete transfer of electrons. In Rubidium oxide : the cation is Rb⁺ and the anion is O²⁻.

2) The FeCl₂ is called as iron(II)chloride. iron(II)chloride is an ionic compound. in  iron(II)chloride : the cation is Fe²⁺ and the anion is Cl⁻.

3) Al(OH)₃ is aluminum hydroxide . In aluminum hydroxide : the cation is present as Al³⁺ and anion is present as OH⁻.

4) LiH is lithium hydride . the cation is Li⁺ and the anion is H⁻.

5) NaCl is sodium chloride. cation is Na⁺ and anion is Cl⁻

Thus, The formulas and and  the names for 5 possible ionic compounds involving these ions. Rb₂O, Rubidium Oxide

FeCl₂, Iron(II)chloride

Al(OH)₃ , Aluminum hydroxide

LiH, Lithium Hydride

NaCl, Sodium chloride

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Answer:

The charge of the metal is +5.

Explanation:

As the chlorine atom has a valence of -1, and the metals have a positive valence, we have to look for the charge that makes the molecule neutral.

In this case, there are 5 Cl, so the total negative charge of Cl is -5.

To make the molecule neutral, the metal must have a positive charge of +5.

answer: The burning of fossil fuels leads to climate change so the correct answer is option D

Explanation: Burning fossil fuels releases a large amount of co2 into the atmosphere. C02 is a greenhouse gas so it traps the sun's heat this, in turn, heats up our atmosphere which leads to climate change.

now option B is wrong because the ozone layer is depleted due to ozone-depleting substances which when it comes to contact with ozone damage it and option c is due to human activities

finally, option d is due to climate change and this is an indirect effect of burning fossil fuels.

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The question provides the concentration of a solution (12% CaCl2) and requests us to calculate how many grams of this solution could be prepared starting from 35g of CaCl2.

Since the concentration of solution is 12%, considering it refers to % in mass, we can write that 12g of CaCl are necessary to prepare 100 g of solution:

12 g of CaCl2 --------------- 100 g of solution

Thus, we can calculate how much solution could be prepared from 35 g of CaCl2:

12 g of CaCl2 --------------- 100 g of solution

35 g of CaCl2 -------------- x

Solving for x, we have that 291.67 g of solution could be prepared from 35g of CaCl2.

Answer:

Explanation:

Here, we want to get the number of moles in 2.24 L of a sample of gas

Mathematically,

At STP, 1 mole of a gas occupies a volume of 22.4 L

Thus x moles will occupy 2.24 L at STP

To get the value of x, we have it that:

Answer

47.60 g

Explanation

Given that:

Molar mass of MgCl₂ = 95.20 g/mol

Mass of Mg produced = 12.15 grams

Equation: MgCl₂ → Mg + Cl₂

What to find:

To calculate the grams of MgCl₂ needed to produce 12.15 grams of Mg.

Step-by-step solution:

Step 1: Convert the mass of Mg produced to moles.

Using the molar mass of Mg (24.305 g/mol) and the mole formula, the moles of Mg produced is

Step 2: Determine the moles of MgCl₂ needed to produce 12.15 g of Mg.

According to the given equation; 1 mol of MgCl₂ produced 1 mol of Mg

So, x mol of MgCl₂ will produce 0.49989714 mol of Mg

That is:

Step 3: Convert the moles of MgCl₂ needed to produce 12.15 g of Mg to grams.

Using the molar mass of MgCl₂ = 95.20 g/mol, therefore the mass in grams of MgCl₂ needed to produce 12.15 g of Mg will be:

Hence, the grams of MgCl₂ needed to produce 12.15 grams of Mg is 47.60 g.

Answer

• Carbon has the atomic symbol C,

• Carbon is a nonmetallic chemical element with 4 electrons in its valence shell, which allows it to form 4 bonds forming compounds like CH₄.

• Reactivity: Carbon does not dissolve in or react with water or acids.

• The atomic mass of carbon is 12.011 g. It contains 6 protons in its nucleus.

Sulphur atom has 16 as its atomic number, which is also the same number of protons and the same number of electrons:

Z = 16

P = 16

e- = 16

But when we have a Sulphur ion, it is usually -2, and since we have 18 electrons in this case, the charge will be -2

Answer

4.94x10^22 molecules

explanation

to calculate the number of molecules in 8.21x10^-2 moles ca be determined by using Avogadros number

we know that

1 mol has 6.022x10^23 molecules

therefore,

8.21x10^-2 moles have:

(8.21x10^-2) x (6.022x10^23)

= 4.94x10^22 molecules

The statement " all the living organisms in an area and their physical surroundings " will describes an ecosystem in the Great Lakes.

A biological combination of cooperating organisms and surrounding physical environment can be referred to as an ecosystem.

A system made up of biotic and abiotic elements that work together as a whole is called an ecosystem. All live things are considered to be biotic components, although non-living items are considered to be abiotic components.

Therefore, "all the living organisms in an area and their physical surroundings " will define ecosystem in the Great Lakes.

The given question is incomplete. The complete question is

Which of the following best describes an ecosystem?

A. all the living organisms in an area

B. all the living organisms in an area and their physical surroundings

C. a region with a distinct climate

D. all the living organisms of the same species throughout the world

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The problem is asking for how many moles of water there are in 1 mol of solution with NaCl. This is telling us that NaCl is dissolved in water.

There are 0.132 moles of NaCl and summing the moles of water, we're going to obtain 1 mol of solution. You can see it, like this:

We just have to clear for 'X moles water', and we obtain:

The answer is that we have 0.868 moles of water in the solution.

-292.8J/mmol

Given the reaction of NaCl and NaOH expressed by the chemical equation:

Amount of heat released when one mole of strong acid reacts with one mole of the strong base is -48.8 kJ/mmol.

If 6 moles of the sample acid reacts with 6 moles of NaOH, the required enthalpy cheange is expressed as:

Hence the enthalpy change if you neutralized six moles of HCl with an equal number of moles NaOH is -292.8J/mmol

Explanation:

We have to find the phase of water at 0.25 atm and 0°C. If we look at the phase diagram of water and throw the lines we will find that the phase of water at those conditions is solid.

Answer: d. Solid

0.168M

The formula for calculating the concentration of the solution is expressed as:

Determine the moles of iron(II) chloride

Given that volume is 0.45L, hence the concentration is expressed as:

Hence the concentration of the solution is 0.168M

In order to solve this question, we can use the concept of molar ratio, which means the amount of reactant is needed in order to produce a certain amount of product. In our question we have:

2 C2H2 + 5 O2 -> 4 CO2 + 2 H2O

The molar ratio between O2 and H2O is 5:2 (we use only the numbers in front of the compound), so that means that for every 5 moles of O2 used, we will have 2 moles of H2O being produce, now we can use this information to calculate how many moles of H2O will be produced from 3.80 moles of O2

5 O2 = 2 H2O

3.80 O2 = x H2O

x = 1.52 moles of H2O are produced from 3.80 moles of O2

Answer: Joules (J)

Explanation:

Answer:

Joules or Newton metre

Explanation:

Work = Force × distance

Force = kgm/s² (Newton)

×

Distance = m

= kgm²/s² (Newton metre or Joules) (Nm or J)

Answer

Explanation

The given chemical equation for the reaction is:

From the given table and question, the enthalpies of formation of the reactants ad products are:

The ∆H° for this reaction can be calculated using the formula below:

Put the each enthalpy of formation of the reactants and the products into the formula:

Therefore, the ∆H° for this reaction is -4791.6 kJ/mol.

In order to find the number of moles in a given mass of any compound, we need to use the molar mass of this compound, which is the total mass present in 1 mol of the compound. The molar mass of CaSO4 is 136.14g/mol

136.14 grams = 1 mol of CaSO4

37.16 grams = x moles of CaSO4

136.14x = 37.16

x = 37.16/136.14

x = 0.27 moles of CaSO4

In 37.16 grams, we will have 0.27 moles of CaSO4

Answer:

Explanation:

Here, we want to get another name for the theoretical value

The theoretical value is simply the value that has been accepted as true

Thus, we can call the theoretical value the true value

Answer

B. sulfur dioxide released from a coal-fired power plant.

Explanation

Power plants release the majority of sulfur dioxide and much of the nitrogen oxides when they burn fossil fuels, such as coal, to produce electricity. In addition, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air. These pollutants cause acid rain.

Therefore, what is directly responsible for acid rain is:

B. sulfur dioxide released from a coal-fired power plant.