STOICHIOMETRY & PERCENT YIELD CLASSWORK

1.) Solid iron (III) oxide reacts with hydrogen gas according to the following equation:

___ Fe₂O₃ + ___ H₂ à ___ Fe + ___ H₂O

(A) How many moles of iron are produced when 450 grams of iron (III) oxide are reacted?

(B) How many grams of water will be produced when 0.0155 moles of hydrogen gas react
completely with iron (III) oxide?

2.) Lithium nitride reacts with water to produce ammonia and lithium hydroxide according to the
following equation: ___ Li₃N + ___ H₂O à ___ NH₃ + ___LiOH
(A) Determine the mass (in grams) of lithium hydroxide produced when 10.87 grams of lithium
nitride reacts with excess water.

(B) The reaction in part (A) was performed by a group of students. If the group recovered 20.41
grams of lithium hydroxide, what was the lab group’s percent yield?

3.) How many molecules of methane (CH₄) can be produced by reacting 37.95 grams of aluminum
carbide with excess HCl?

___ Al₄C₃ + ___ HCl à ___ CH₄ + ___ AlCl₃

4.) How many moles of water are needed to react with 0.23 moles of chlorine according to the
following equation?

___ Na₂S₂O₃ + ___ Cl₂ + 5 H₂O à ___ NaHSO₄ + ___HCl

5.) What mass (in grams) of H₂SO₄ is required to react completely with excess NaHCO₃ in order to
produce 6.75 x 10²³ molecules of CO₂?

___ NaHCO₃ + ___ H₂SO₄ à ___ Na₂SO₄ + ___ H₂O + ___ CO₂

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