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