CHEMISTRY 101 FINAL IVY TECH

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CHEMISTRY 101 FINAL IVY TECH

QUESTIONS WITH COMPL ETE

SOLUTION

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical

equation is:

O2 + Mg ⟶ 2 MgO

Question 1: If 4 moles of magnesium totally reacted with

more than enough O2, how many moles of MgO would be expected to form?

• 8 Moles
• 2 Moles
• 4 Moles
• 1 Mole
• Not Enough Info

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CORRECT ANSWER: C

Question 2: Which of the following is TRUE?

• Stoichiometry allows prediction of how much of the

reactants are necessary to form a given amount of product.

• All of the above are true.
• Stoichiometry allows prediction of the amount of

products that form in a chemical reaction based on the amounts of reactants.

• Stoichiometry shows the numerical relationship

between chemical quantities in a balanced chemical equation.

CORRECT ANSWER: B

Diatomic N2 can react with diatomic H2 to form

ammonia (NH3). The balanced chemical equation is:

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N2 + 3 H2 ⟶ 2 NH3

Question 3: If 6 moles of H2 totally reacted with more

than enough N2, how many moles of ammonia would be expected to form?

• 4 Moles
• 6 Moles
• 3 Moles
• 2 Moles
• Not enough info

CORRECT ANSWER: A

Question 4: How many grams of the excess reactant

remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g of CuSO4?

Reaction: Na2S + CuSO4 ⟶ Na2SO4 + CuS

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A. 0.05

B. 9.58

C. 5.92

D. 15.45

CORRECT ANSWER: B

Question 5: Calculate the maximum number of grams of

NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g of H2.

Reaction: N2 (g) + 3H2 (g) ⟶ 2 NH3 (g)

A. 2.43

B. 0.964

• None of the above

D. 4.00

E. 17.0