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Practice Problems: Limiting & Excess Reagents
- For the reaction
2S(s) + 30 2
(g) ~ 2S 3
(g)
if 6.3 g of S is reacted with 10.0 g of 02' show by calculation which one will be the limiting
reactant.
- For the reaction
CaC 3
(s) + 2HCl(aq) ~ CaC 2
(aq) + CO 2
(g) + H 2
0(l)
68.1 g solid CaC 3
is mixed with 51.6 g HCl. What number of grams of CO 2
will be
produced?
[A] 69.4 g CO 2
[D] 15.0 g CO 2
[B] 29.9 g CO 2
[E] 59.8 g CO 2
[C] 33.7 g CO 2
- For the reaction
2CI
(g) + 4NaOH(aq) ~ 3NaCl(aq) + NaCI 2
(aq) + 2H 2
0(I)
11.9 g C 2
is reacted with 12.0 g NaOH. Determine which is the limiting reactant.
- Consider the reaction
Mg 2
Si(s) + 4H 2
0(l) ~ 2Mg(OHh(aq) + SiH 4
(g)
Which of the reactants is in excess if we start with 50.0 g of each reactant?
- Sodium and water react according to the reaction
2Na(s) + 2H 2
0(l) ~ 2NaOH(aq) + H 2
(g)
What number of moles ofH 2
will be produced when 4 mol Na is added to 2 mol H 2
[A] 4 mol [B] 1 mol [C] 3 mol [D] 2 mol [E] none of these
- For the reaction ofC 2
H
4
(g) with 02(g) to form CO 2
(g) and H 2
0(g), what number of moles
of CO 2
can be produced by the reaction of 5.00 mol C 2
H
4
and 12.0 mol 02?
[A] 10.0 mol [B] 4.00 mol [C] 8.00 mol [D] 5.00 mol [E] none of these
- For the reaction ofC 2
H
4
(g) with 02(g) to form CO 2
(g) and H 2
0(g), what number of moles
of CO 2
can be produced by the reaction of 0.480 mol of C 2
H
4
and 1.08 mol of 02?
[A] 0.864 mol [B] 0.240 mol [C] 0.960 mol [D] 0.720 mol [E] none of these
Practice Problems: Limiting & Excess Reagents
- For the reaction of C 2
H
(g) with 02(g) to form CO 2
(g) and H 2
0(g), what number of grams
of CO 2
could be produced from 2.0 g ofC 2
H
and 5.0 g of 2
[A] 6.3 g [B] 7.6 g [C] 5.5 g [D] 4.6 g [E] none of these
- In the reaction ofCsH1S(l) with 02(g) to form CO 2
(g) and H 2
0(g), 2.28 g CsH 1S
is reacted
with 7.00 g of 2
. Determine which is the limiting reactant.
10. The limiting reactant in a reaction is
[A] the reactant for which there is the most amount in grams
[B] the reactant for which there is the least amount in grams
[C] the reactant for which there is the fewest number of moles
[D] the reactant which has the lowest coefficient in a balanced equation
[E] none of these
11. The limiting reactant is the reactant
[A] that is left over after the reaction has gone to completion
[B] that has the lowest coefficient in the balanced equation
[C] for which you have the lowest mass in grams
[D] that has the lowest molar mass [E] none of these
- In the reaction between CO and Fe304' the theoretical yield in an experiment is calculated
to be 47.2 g Fe. When a careless chemistry student carries out the experiment, the actual
yield is 42.9 g Fe. Calculate the percentage yield.
- When NH 3
is prepared from 28 g N 2
and excess H 2
, the theoretical yield ofNH 3
is 34 g.
When this reaction is carried out in a given experiment, only 30. g is produced. What is the
percentage yield?
[A] 14% [B] 6% [C] 12% [D] 82% [E] 88%
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