CART - Chemistry Acceleration Readiness Stoichiometry and Mole Concepts Questions and Answers

Question 1

What is the molar mass of iron(III) sulfate, Fe₂(SO₄)₃?

Accepted Answer

399.88 g/mol

Answer

207.75 g/mol

Answer

349.91 g/mol

Answer

407.87 g/mol

Question 2

In the combustion of methane (CH₄), how much carbon dioxide (CO₂) in grams is produced from the complete combustion of 32.0 grams of methane? The balanced equation is: CH₄ + 2O₂ → CO₂ + 2H₂O

Accepted Answer

88.0 g

Answer

44.0 g

Answer

176.0 g

Answer

22.0 g

Question 3

A student reacts 25.0 g of nitrogen (N₂) with 5.0 g of hydrogen (H₂) to produce ammonia (NH₃) according to the equation: N₂ + 3H₂ → 2NH₃. Which of the following statements is correct?

Accepted Answer

Hydrogen (H₂) is the limiting reactant, and excess nitrogen (N₂) remains.

Answer

Nitrogen (N₂) is the limiting reactant, and excess hydrogen (H₂) remains.

Answer

Both reactants are completely consumed.

Answer

Ammonia (NH₃) is the limiting reactant.

Question 4

How many individual carbon atoms are present in a 24.02 gram sample of pure carbon?

Accepted Answer

1.204 x 10²⁴ atoms

Answer

6.022 x 10²³ atoms

Answer

3.011 x 10²³ atoms

Answer

2.408 x 10²⁴ atoms

Question 5

In a laboratory experiment, the reaction of 15.0 g of aluminum (Al) with excess hydrochloric acid (HCl) produced 1.55 g of hydrogen gas (H₂). What is the percent yield of hydrogen? The balanced equation is: 2Al(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂(g)

Accepted Answer

92.3%

Answer

10.3%

Answer

1.68%

Answer

88.6%

Question 6

Which of the following samples contains the greatest number of moles of the substance?

Accepted Answer

90.0 g of H₂O (Molar Mass ≈ 18 g/mol)

Answer

60.0 g of C₂H₆ (Molar Mass ≈ 30 g/mol)

Answer

100.0 g of O₂ (Molar Mass ≈ 32 g/mol)

Answer

200.0 g of CaCO₃ (Molar Mass ≈ 100 g/mol)