Question 1

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g) -When 36.0 g of H₂O react, how many grams of NH₃ are produced?

Accepted Answer

The molar mass of H₂O is 18.0 g/mol, so 36.0 g of H₂O is 2 moles. According to the balanced equation, 6 moles of H₂O produce 2 moles of NH₃. Therefore, 2 moles of H₂O produce 2/3 moles of NH₃. The molar mass of NH₃ is 17.0 g/mol, so 2/3 moles of NH₃ is 11.3 g.

Question 2

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -In the reaction of nitrogen gas, N₂, with hydrogen gas, H₂, to form ammonia gas, NH₃ , how many moles of hydrogen are needed to react with two moles of nitrogen?

Accepted Answer

The balanced equation for the formation of ammonia is N₂ + 3H₂ → 2NH₃. Therefore, 3 moles of hydrogen are needed for every mole of nitrogen. For 2 moles of nitrogen, 6 moles of hydrogen are required.

Question 3

How many grams of glucose (C₆H₁₂O₆) are in 3.55 moles of glucose?

Accepted Answer

The molar mass of glucose is 180.16 g/mol. To find the mass of 3.55 moles of glucose, we can use the formula:

mass = moles x molar mass

mass = 3.55 mol x 180.16 g/mol = 639 g

Therefore, the answer is B.

Question 4

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

Accepted Answer

The molar mass of O₂ is 32 g/mol, so 40.0 g of O₂ is 40.0/32 = 1.25 mol. According to the balanced equation, 1 mol of O₂ produces 2 mol of MgO. Therefore, 1.25 mol of O₂ will produce 2.5 mol of MgO. The molar mass of MgO is 40.3 g/mol, so 2.5 mol of MgO is 2.5 * 40.3 = 100.75 g, which rounds to 101 g.

Question 5

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g) -What is the correct form of the conversion factor needed to convert the number of moles of H?O to the number of moles of NH₃produced?

Accepted Answer

The balanced equation shows that 6 moles of H2O react with 1 mole of Mg3N2 to produce 2 moles of NH3. Therefore, the correct conversion factor is 2 moles of NH3 / 6 moles of H2O.

Question 6

The molar mass of C₃H₈O₂ is

Accepted Answer

To find the molar mass of C₃H₈O₂, we need to sum the atomic masses of all the atoms in one molecule of C₃H₈O₂. 
- Carbon has an atomic mass of approximately 12.01 g/mol, and we have three carbon atoms. 
- Hydrogen has an atomic mass of approximately 1.01 g/mol, and we have eight hydrogen atoms. 
- Oxygen has an atomic mass of approximately 16.00 g/mol, and we have two oxygen atoms.

Molar mass = (3 x 12.01 g/mol) + (8 x 1.01 g/mol) + (2 x 16.00 g/mol)
= 36.03 g/mol + 8.08 g/mol + 32.00 g/mol
= 76.11 g/mol

Rounding to the nearest tenth gives us the answer of A) 76.0 g.

Question 7

The molar mass of calcium hydroxide, Ca(OH)₂, is

Accepted Answer

The answer of The molar mass of calcium hydroxide, Ca(OH)₂,...

Question 8

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is

Accepted Answer

According to the balanced chemical equation, 1 mole of O₂ reacts with 2 moles of Mg to produce 2 moles of MgO. Therefore, to find the moles of MgO produced when 0.20 mole of O₂ reacts, we need to use stoichiometry.

(0.20 mol O₂) x (2 mol MgO/1 mol O₂) = 0.40 mol MgO

Therefore, the number of moles of MgO produced is 0.40 mole, which corresponds to choice C.

Question 9

4.00 moles of sodium have a mass of

Accepted Answer

The atomic mass of sodium (Na) is approximately 23 g/mol. Therefore, 4.00 moles of sodium would have a mass of 4.00 moles * 23 g/mol = 92 g.

Question 10

What is the molar mass of Mg₃(PO₄)₂, a substance formerly used in medicine as an antacid?

Accepted Answer

The molar mass of Mg₃(PO₄)₂ is calculated by adding the atomic masses of all atoms: 3 Mg (24.3 each) + 2 P (30.97 each) + 8 O (16 each) = 262.9 g/mol.

Question 11

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-How many grams of H₂O are needed to produce 150 g of Mg(OH)₂?

Accepted Answer

To find the grams of H₂O needed, first calculate the moles of Mg(OH)₂ produced: 150 g / 58.32 g/mol = 2.57 mol. According to the balanced equation, 6 moles of H₂O are needed for every 3 moles of Mg(OH)₂, so 2.57 mol Mg(OH)₂ requires 5.14 mol H₂O. The molar mass of H₂O is 18.02 g/mol, so 5.14 mol × 18.02 g/mol = 92.6 g, which rounds to 93 g.

Question 12

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃?

Accepted Answer

The molar mass of Fe2O3 is 159.69 g/mol. Therefore, 0.500 mole of Fe2O3 is equal to 0.500 mole * 159.69 g/mol = 79.8 g.

Question 13

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 
2H₂ + O₂ → 2H₂O

Accepted Answer

To produce 1.80 g of water, we use the molar mass of water (18.02 g/mol) to find moles of water: 1.80 g / 18.02 g/mol = 0.1 mol. From the balanced equation, 2 moles of H₂ produce 2 moles of H₂O, so 0.1 mol of H₂O requires 0.1 mol of H₂. The molar mass of H₂ is 2.02 g/mol, so 0.1 mol of H₂ is 0.1 mol × 2.02 g/mol = 0.202 g, which rounds to 0.200 g.

Question 14

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

Accepted Answer

The balanced equation shows that 2 moles of Mg reacts with 1 mole of O₂. Therefore, 4 moles of Mg would require 2 moles of O₂.

Question 15

How many moles of K₂SO₄ are in 15.0 g of K₂SO₄?

Accepted Answer

The molar mass of K₂SO₄ is approximately 174.26 g/mol. To find the number of moles, divide the mass by the molar mass: 15.0 g / 174.26 g/mol ≈ 0.0861 moles.

Question 16

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-How many moles of magnesium are needed to react with 0.50 mole of O₂?

Accepted Answer

According to the balanced chemical equation, 2 moles of Mg react with 1 mole of O₂. Therefore, to react with 0.50 moles of O₂, we need (2/1) x 0.50 = 1.0 mole of Mg. Therefore, the answer is B.

Question 17

For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂, how many moles of aluminum chloride are produced?

Accepted Answer

The balanced chemical equation for the reaction between aluminum and chlorine gas is:

2Al + 3Cl₂ → 2AlCl₃

This tells us that for every 2 moles of Al that react, we need 3 moles of Cl₂. However, the problem states that we have an excess of chlorine gas, so we don't need to worry about the amount of chlorine.

We are given 4 moles of aluminum, and from the balanced equation, we know that 2 moles of aluminum produces 2 moles of aluminum chloride. Therefore, 4 moles of aluminum will produce:

(4 moles Al) x (2 moles AlCl₃/2 moles Al) = 4 moles AlCl₃

So the answer is D, 4 moles.

Question 18

3.00 moles of NO₂ have a mass of

Accepted Answer

The molar mass of NO₂ is 46.0 g/mol. Therefore, 3.00 moles of NO₂ would have a mass of 3.00 moles × 46.0 g/mol = 138 g.

Question 19

For the question(s) that follow, consider the following balanced equation.
Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH)₂(s) + 2NHS1U1B13S1U1B0(g)
-When 2 moles of Mg₃N₂ are allowed to react, how many moles of H₂O also react?

Accepted Answer

According to the balanced equation, 1 mole of Mg₃N₂ reacts with 6 moles of H₂O. Therefore, 2 moles of Mg₃N₂ will react with 12 moles of H₂O.

Question 20

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe₂O? produced? 4Fe(s) + 3O? (g) ? 2Fe₂O?(s)

Accepted Answer

The balanced equation indicates that 3 moles of O₂ reacts with 2 moles of Fe₂O₃ to produce 4 moles of Fe. Therefore, the correct conversion factor to determine the number of moles of Fe₂O₃ produced from the number of moles of O₂ is: (2 moles Fe₂O₃ / 3 moles O₂) This is equivalent to: (2 moles Fe₂O₃ / 3 moles O₂) * (2 moles Fe / 4 moles Fe₂O₃) Simplifying, we get: (2 moles Fe / 3 moles O₂) Therefore, the correct choice is E.

Quiz 6: Chemical Reactions and Quantities

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -When 36.0 g of H₂O react, how many grams of NH₃ are produced?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -In the reaction of nitrogen gas, N₂, with hydrogen gas, H₂, to form ammonia gas, NH₃ , how many moles of hydrogen are needed to react with two moles of nitrogen?

How many grams of glucose (C₆H₁₂O₆) are in 3.55 moles of glucose?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -What is the correct form of the conversion factor needed to convert the number of moles of H?O to the number of moles of NH₃produced?

The molar mass of C₃H₈O₂ is

The molar mass of calcium hydroxide, Ca(OH) ₂, is

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is

4.00 moles of sodium have a mass of

What is the molar mass of Mg₃(PO₄) ₂, a substance formerly used in medicine as an antacid?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -How many grams of H₂O are needed to produce 150 g of Mg(OH) ₂?

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

How many moles of K₂SO₄ are in 15.0 g of K₂SO₄?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -How many moles of magnesium are needed to react with 0.50 mole of O₂?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂, how many moles of aluminum chloride are produced?

3.00 moles of NO₂ have a mass of

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -When 2 moles of Mg₃N₂ are allowed to react, how many moles of H₂O also react?

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe₂O? produced? 4Fe(s) + 3O? (g) ? 2Fe₂O?(s)

Quiz 6: Chemical Reactions and Quantities

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH3(g) -When 36.0 g of H₂O react, how many grams of NH3 are produced?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -In the reaction of nitrogen gas, N₂, with hydrogen gas, H₂, to form ammonia gas, NH3 , how many moles of hydrogen are needed to react with two moles of nitrogen?

How many grams of glucose (C6H12O6) are in 3.55 moles of glucose?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH3(g) -What is the correct form of the conversion factor needed to convert the number of moles of H?O to the number of moles of NH3 produced?

The molar mass of C₃H₈O₂ is

The molar mass of calcium hydroxide, Ca(OH) ₂, is

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is

4.00 moles of sodium have a mass of

What is the molar mass of Mg₃(PO₄) ₂, a substance formerly used in medicine as an antacid?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH3(g) -How many grams of H₂O are needed to produce 150 g of Mg(OH) ₂?

How many grams of Fe2O₃ are there in 0.500 mole of Fe2O₃?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH3(g) -How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of oxygen gas needed to react with 4.0 moles of Mg is

How many moles of K2SO₄ are in 15.0 g of K2SO₄?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -How many moles of magnesium are needed to react with 0.50 mole of O₂?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl₂, how many moles of aluminum chloride are produced?

3.00 moles of NO₂ have a mass of

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH3(g) -When 2 moles of Mg₃N₂ are allowed to react, how many moles of H₂O also react?

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe2O? produced? 4Fe(s) + 3O? (g) ? 2Fe2O?(s)

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -When 36.0 g of H₂O react, how many grams of NH₃ are produced?

For the question(s) that follow, consider the following equation. 2Mg + O₂ → 2MgO -In the reaction of nitrogen gas, N₂, with hydrogen gas, H₂, to form ammonia gas, NH₃ , how many moles of hydrogen are needed to react with two moles of nitrogen?

How many grams of glucose (C₆H₁₂O₆) are in 3.55 moles of glucose?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -What is the correct form of the conversion factor needed to convert the number of moles of H?O to the number of moles of NH₃produced?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -How many grams of H₂O are needed to produce 150 g of Mg(OH) ₂?

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H₂ + O₂ → 2H₂O

How many moles of K₂SO₄ are in 15.0 g of K₂SO₄?

For the question(s) that follow, consider the following balanced equation. Mg₃N₂(s) + 6H₂O(l) → 3Mg(OH) ₂(s) + 2NH₃(g) -When 2 moles of Mg₃N₂ are allowed to react, how many moles of H₂O also react?

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O? to the number of moles of Fe₂O? produced? 4Fe(s) + 3O? (g) ? 2Fe₂O?(s)