Question 1

If the relative atomic mass of ⁵⁶Fe is 55.935 (on the ¹²C scale), what is the mass of one ⁵⁶Fe atom?

Accepted Answer

D

Question 2

Which has the greatest number of hydrogen atoms?

Accepted Answer

D

Question 3

Which of these carbohydrates has the largest molecular mass?

Accepted Answer

Raffinose has the largest molecular mass because it has the most carbon, hydrogen, and oxygen atoms among the given carbohydrates.

Question 4

What is the relative molecular mass of the compound trinitrotoluene, C₇H₅N₃O₆ (on the ¹²C scale)?

Accepted Answer

The answer of What is the relative molecular mass of...

Question 5

Assume a kernel of wheat has a volume of 8 mm³. How many moles of wheat kernels can fit in the world's largest grain elevator with a capacity of 20 million bushels (1 bushel = 35.24 L)?

Accepted Answer

The answer of Assume a kernel of wheat has a...

Question 6

Vitamin B₁₂, cyanocobalamin, has the molecular formula, C₆₈H₈₈CoN₁₄O₁₄P. What is the percent mass of cobalt in this compound?

Accepted Answer

To find the percent mass of cobalt, divide the atomic mass of cobalt (58.93 g/mol) by the molar mass of cyanocobalamin (approximately 1355 g/mol) and multiply by 100. This gives approximately 4.35%.

Question 7

Which of the following carbohydrates has the largest percent mass of carbon?

Accepted Answer

The answer of Which of the following carbohydrates has the...

Question 8

Magnetite is a mineral compound that is 72.36% iron and 27.64% oxygen by mass. What is the empirical formula for the compound that makes up magnetite?

Accepted Answer

The empirical formula is determined by the simplest whole number ratio of moles of each element. For magnetite, the ratio of iron to oxygen is 3:4, which corresponds to the empirical formula Fe₃O₄.

Question 9

You have 25.0 g of a compound that contains only silicon and nitrogen. Chemical analysis reveals that your sample contains 15.0 g of silicon. What is the empirical formula for your compound?

Accepted Answer

To find the empirical formula, calculate the moles of each element. Silicon: 15.0 g / 28.09 g/mol = 0.534 mol. Nitrogen: (25.0 g - 15.0 g) / 14.01 g/mol = 0.714 mol. The mole ratio is approximately 3:4, giving the empirical formula Si₃N₄.

Question 10

You have a compound that contains only carbon and hydrogen. If you burn the compound at high temperature in the presence of oxygen it is completely converted to CO₂ and H₂O. When you react 20.0 g of your sample you generate 62.7 g of CO₂ and 25.7 g of H₂O. Which of the following is a possible formula for your compound?

Accepted Answer

The answer of You have a compound that contains only...

Question 11

Methane CH₄ reacts with molecular oxygen, O₂, to form carbon dioxide, CO₂, and water, H₂O. In a balanced chemical equation for this reaction there will always be

Accepted Answer

In the balanced equation CH₄ + 2O₂ → CO₂ + 2H₂O, there are twice as many moles of H₂O as CO₂.

Question 12

For the given unbalanced reaction X CaO(s) + y H₂O(l) → z Ca(OH)₂ The correct stiochiometric coefficients x, y, & z are

Accepted Answer

The correct stoichiometric coefficients are x = 1, y = 2, and z = 1. This can be determined by balancing the equation:CaO(s) + 2H2O(l) → Ca(OH)2(aq)

Question 13

Barium hydroxide reacts with hydrochloric acid to produce barium chloride and water. A balanced chemical equation for this reaction is?

Accepted Answer

The balanced chemical equation is Ba(OH)₂ + 2HCl → BaCl₂ + 2H₂O, which correctly balances the number of atoms for each element on both sides of the equation.

Question 14

Which of the following is not correctly balanced?

Accepted Answer

The equation D is not balanced because the number of sodium (Na) atoms is not equal on both sides of the equation.

Question 15

In fermentation, sucrose, C₁₂H₂₂O₁₁, reacts with water to form ethanol, C₂H₅OH, and carbon dioxide. A balanced chemical equation for this reaction is?

Accepted Answer

The answer of In fermentation, sucrose, C₁₂H₂₂O₁₁, reacts with water...

Question 16

Tetrasilane (Si₄H₁₀) is a liquid with can react with oxygen to form SiO₂ and water. How many moles of water are produced from each mole of tetrasilane that reacts?

Accepted Answer

The balanced chemical equation for the reaction of tetrasilane with oxygen is Si4H10 + 7O2 → 4SiO2 + 5H2O. Therefore, 5 moles of water are produced per mole of tetrasilane.

Question 17

Citric acid (C₆H₈O₇) is produced from fermentation of sugars such as sucrose (C₁₂H₂₂O₁₁). In this process oxygen reacts with the sugar to produce citric acid and water as products. How many moles of citric acid can be produced from one mole of sucrose?

Accepted Answer

The balanced chemical equation for the reaction is:C₁₂H₂₂O₁₁ + 3O₂ → 2C₆H₈O₇ + 2H₂OFrom the equation, we can see that 1 mole of sucrose produces 2 moles of citric acid.

Question 18

Nitrogen gas reacts with hydrogen gas to produce ammonia. 3 H₂(g) + N₂(g) → 2 NH₃(g) How many grams of nitrogen are required to produce 1.000 g of ammonia?

Accepted Answer

The balanced chemical equation shows that 1 mole of nitrogen gas (N2) reacts with 3 moles of hydrogen gas (H2) to produce 2 moles of ammonia (NH3). The molar mass of nitrogen is 14.01 g/mol, and the molar mass of ammonia is 17.03 g/mol. Therefore, 1.000 g of ammonia contains 1.000 g / 17.03 g/mol = 0.0587 mol of ammonia. According to the balanced chemical equation, 0.0587 mol of ammonia requires 0.0587 mol / 2 = 0.0293 mol of nitrogen gas. The mass of nitrogen gas required is 0.0293 mol * 14.01 g/mol = 0.4112 g.

Question 19

Methane can be reacted with steam to produce carbon dioxide and hydrogen gas in a two step reaction. The resulting overall reaction can be written CH₄(g) + 2 H₂O(g) → CO₂(g) + 4 H₂(g) How many grams of hydrogen can be produced from each gram of methane?

Accepted Answer

The answer of Methane can be reacted with steam to...

Question 20

Magnesium will react with carbon dioxide to form magnesium oxide and carbon. 2 Mg(s) + CO₂(g) → 2MgO(s) + C(s) 20)0 grams of magnesium react completely with excess carbon dioxide. How many grams of solid product should be formed?

Accepted Answer

The molar mass of Mg is 24.31 g/mol, so 200 g of Mg is 8.23 mol. The reaction produces 2 moles of MgO for every 2 moles of Mg, so 8.23 mol of Mg will produce 8.23 mol of MgO. The molar mass of MgO is 40.31 g/mol, so 8.23 mol of MgO weighs 331.76 g. However, since the question asks for the mass of solid product (MgO and C), we must also consider the carbon produced. The reaction produces 1 mole of C for every 2 moles of Mg, so 8.23 mol of Mg will produce 4.115 mol of C. The molar mass of C is 12.01 g/mol, so 4.115 mol of C weighs 49.43 g. Adding the masses of MgO and C gives 331.76 g + 49.43 g = 381.19 g, which rounds to 38.1 g.

Quiz 2: Chemical Formulas, Equations, and Reaction Yields

If the relative atomic mass of ⁵⁶Fe is 55.935 (on the ¹²C scale) , what is the mass of one ⁵⁶Fe atom?

Which has the greatest number of hydrogen atoms?

Which of these carbohydrates has the largest molecular mass?

What is the relative molecular mass of the compound trinitrotoluene, C₇H₅N₃O₆ (on the ¹²C scale) ?

Assume a kernel of wheat has a volume of 8 mm³. How many moles of wheat kernels can fit in the world's largest grain elevator with a capacity of 20 million bushels (1 bushel = 35.24 L) ?

Vitamin B₁₂, cyanocobalamin, has the molecular formula, C₆₈H₈₈CoN₁₄O₁₄P. What is the percent mass of cobalt in this compound?

Which of the following carbohydrates has the largest percent mass of carbon?

Magnetite is a mineral compound that is 72.36% iron and 27.64% oxygen by mass. What is the empirical formula for the compound that makes up magnetite?

You have 25.0 g of a compound that contains only silicon and nitrogen. Chemical analysis reveals that your sample contains 15.0 g of silicon. What is the empirical formula for your compound?

Methane CH₄ reacts with molecular oxygen, O₂, to form carbon dioxide, CO₂, and water, H₂O. In a balanced chemical equation for this reaction there will always be

For the given unbalanced reaction X CaO(s) + y H₂O(l) → z Ca(OH) ₂ The correct stiochiometric coefficients x, y, & z are

Barium hydroxide reacts with hydrochloric acid to produce barium chloride and water. A balanced chemical equation for this reaction is?

Which of the following is not correctly balanced?

In fermentation, sucrose, C₁₂H₂₂O₁₁, reacts with water to form ethanol, C₂H₅OH, and carbon dioxide. A balanced chemical equation for this reaction is?

Tetrasilane (Si₄H₁₀) is a liquid with can react with oxygen to form SiO₂ and water. How many moles of water are produced from each mole of tetrasilane that reacts?

Citric acid (C₆H₈O₇) is produced from fermentation of sugars such as sucrose (C₁₂H₂₂O₁₁) . In this process oxygen reacts with the sugar to produce citric acid and water as products. How many moles of citric acid can be produced from one mole of sucrose?

Nitrogen gas reacts with hydrogen gas to produce ammonia. 3 H₂(g) + N₂(g) → 2 NH₃(g) How many grams of nitrogen are required to produce 1.000 g of ammonia?

Methane can be reacted with steam to produce carbon dioxide and hydrogen gas in a two step reaction. The resulting overall reaction can be written CH₄(g) + 2 H₂O(g) → CO₂(g) + 4 H₂(g) How many grams of hydrogen can be produced from each gram of methane?

Magnesium will react with carbon dioxide to form magnesium oxide and carbon. 2 Mg(s) + CO₂(g) → 2MgO(s) + C(s) 20) 0 grams of magnesium react completely with excess carbon dioxide. How many grams of solid product should be formed?

Quiz 2: Chemical Formulas, Equations, and Reaction Yields

If the relative atomic mass of 56Fe is 55.935 (on the 12C scale) , what is the mass of one 56Fe atom?

Which has the greatest number of hydrogen atoms?

Which of these carbohydrates has the largest molecular mass?

What is the relative molecular mass of the compound trinitrotoluene, C7H5N3O6 (on the 12C scale) ?

Assume a kernel of wheat has a volume of 8 mm3. How many moles of wheat kernels can fit in the world's largest grain elevator with a capacity of 20 million bushels (1 bushel = 35.24 L) ?

Vitamin B12, cyanocobalamin, has the molecular formula, C68H88CoN14O14P. What is the percent mass of cobalt in this compound?

Which of the following carbohydrates has the largest percent mass of carbon?

Magnetite is a mineral compound that is 72.36% iron and 27.64% oxygen by mass. What is the empirical formula for the compound that makes up magnetite?

You have 25.0 g of a compound that contains only silicon and nitrogen. Chemical analysis reveals that your sample contains 15.0 g of silicon. What is the empirical formula for your compound?

Methane CH4 reacts with molecular oxygen, O2, to form carbon dioxide, CO2, and water, H2O. In a balanced chemical equation for this reaction there will always be

For the given unbalanced reaction X CaO(s) + y H2O(l) → z Ca(OH) 2 The correct stiochiometric coefficients x, y, & z are

Barium hydroxide reacts with hydrochloric acid to produce barium chloride and water. A balanced chemical equation for this reaction is?

Which of the following is not correctly balanced?

In fermentation, sucrose, C12H22O11, reacts with water to form ethanol, C2H5OH, and carbon dioxide. A balanced chemical equation for this reaction is?

Tetrasilane (Si4H10) is a liquid with can react with oxygen to form SiO2 and water. How many moles of water are produced from each mole of tetrasilane that reacts?

Citric acid (C6H8O7) is produced from fermentation of sugars such as sucrose (C12H22O11) . In this process oxygen reacts with the sugar to produce citric acid and water as products. How many moles of citric acid can be produced from one mole of sucrose?

Nitrogen gas reacts with hydrogen gas to produce ammonia. 3 H2(g) + N2(g) → 2 NH3(g) How many grams of nitrogen are required to produce 1.000 g of ammonia?

Methane can be reacted with steam to produce carbon dioxide and hydrogen gas in a two step reaction. The resulting overall reaction can be written CH4(g) + 2 H2O(g) → CO2(g) + 4 H2(g) How many grams of hydrogen can be produced from each gram of methane?

Magnesium will react with carbon dioxide to form magnesium oxide and carbon. 2 Mg(s) + CO2(g) → 2MgO(s) + C(s) 20) 0 grams of magnesium react completely with excess carbon dioxide. How many grams of solid product should be formed?

If the relative atomic mass of ⁵⁶Fe is 55.935 (on the ¹²C scale) , what is the mass of one ⁵⁶Fe atom?

What is the relative molecular mass of the compound trinitrotoluene, C₇H₅N₃O₆ (on the ¹²C scale) ?

Assume a kernel of wheat has a volume of 8 mm³. How many moles of wheat kernels can fit in the world's largest grain elevator with a capacity of 20 million bushels (1 bushel = 35.24 L) ?

Vitamin B₁₂, cyanocobalamin, has the molecular formula, C₆₈H₈₈CoN₁₄O₁₄P. What is the percent mass of cobalt in this compound?

Methane CH₄ reacts with molecular oxygen, O₂, to form carbon dioxide, CO₂, and water, H₂O. In a balanced chemical equation for this reaction there will always be

For the given unbalanced reaction X CaO(s) + y H₂O(l) → z Ca(OH) ₂ The correct stiochiometric coefficients x, y, & z are

In fermentation, sucrose, C₁₂H₂₂O₁₁, reacts with water to form ethanol, C₂H₅OH, and carbon dioxide. A balanced chemical equation for this reaction is?

Tetrasilane (Si₄H₁₀) is a liquid with can react with oxygen to form SiO₂ and water. How many moles of water are produced from each mole of tetrasilane that reacts?

Citric acid (C₆H₈O₇) is produced from fermentation of sugars such as sucrose (C₁₂H₂₂O₁₁) . In this process oxygen reacts with the sugar to produce citric acid and water as products. How many moles of citric acid can be produced from one mole of sucrose?

Nitrogen gas reacts with hydrogen gas to produce ammonia. 3 H₂(g) + N₂(g) → 2 NH₃(g) How many grams of nitrogen are required to produce 1.000 g of ammonia?

Methane can be reacted with steam to produce carbon dioxide and hydrogen gas in a two step reaction. The resulting overall reaction can be written CH₄(g) + 2 H₂O(g) → CO₂(g) + 4 H₂(g) How many grams of hydrogen can be produced from each gram of methane?

Magnesium will react with carbon dioxide to form magnesium oxide and carbon. 2 Mg(s) + CO₂(g) → 2MgO(s) + C(s) 20) 0 grams of magnesium react completely with excess carbon dioxide. How many grams of solid product should be formed?