Chapter 12 Practice
#1 Name
____________________________________

Show your work, use
the correct sig figs, and include the units. Answers in
parenthesis.

1.
Calculate
the number of moles of nitrogen dioxide (NO_{2}) produced when 3.0
moles of oxygen are produced in the decomposition of nitric acid by light? (12
mol NO_{2})

4 HNO_{3} → 4 NO_{2} +
2 H_{2}O + O_{2}

2.
Calculate
the number of moles of Na_{2}CS_{3} produced from 0.60 moles of
CS_{2} by the following reaction. (0.40 mol Na_{2}CS_{3})

3 CS_{2} + 6
NaOH → 2 Na_{2}CS_{3} + Na_{2}CO_{3} + 3
H_{2}O

3. How many grams of Si_{3}N_{4}
can be produced from 0.46 moles of N_{2}? (32 g Si_{3}N_{4})

3 Si + 2 N_{2}
→ Si_{3}N_{4}

4.
How many
moles of NO can be produced from 0.680 g of NH_{3} according to the
following reaction?

(.0399 mol NO)

4 NH_{3} + 5 O_{2} → 4
NO + 6 H_{2}O

5.
How many
moles of SO_{2} are required to convert 6.8 g of H_{2}S
according to the following reaction?

(0.10 mol SO_{2})

2 H_{2}S + SO_{2} → 3 S + 2 H_{2}O

6.
How many
grams of carbon is required to produce 0.460 moles of SiC?).(16.6 g C)

SiO_{2} + 3 C → SiC + 2 CO

7.
How many
grams of HClO_{3} can be produced from 7.2 g of ClO_{2}
according to the following reaction?

(7.5g HClO_{3})

6 ClO_{2} + 3 H_{2}O → 5 HClO_{3} + HCl

8.
How many
grams of H_{2}O_{2} are required to react with 11 g of N_{2}H_{4}
according to the following reaction?

(82 g H_{2}O_{2})

7 H_{2}O_{2} + N_{2}H_{4}
→ 2 HNO_{3}
+ 8 H_{2}O

9. Given
the following equation: 2 KClO_{3} →2 KCl + 3 O_{2
}How many moles of O_{2} can be produced
by letting 12.00 moles of KClO_{3} react?

10. Given the
following equation: 2 K + Cl_{2} → 2 KCl

How many grams of KCl is produced from 2.50 g of K
and excess Cl_{2}

11. Given the
following equation: Na_{2}O + H_{2}O → 2 NaOH

How many grams of NaOH is
produced from 1.20 x 10^{2} grams of Na_{2}O?

12. Given the
following equation: 8 Fe + S_{8 }→ 8

What mass of iron is needed to react with 16.0 grams
of sulfur?

13. The average
human requires 120.0 grams of glucose (C_{6}H_{12}O_{6})
per day. How many grams of CO_{2} (in the photosynthesis reaction) are
required for this amount of glucose?

The photosynthetic reaction is: 6
CO_{2} + 6 H_{2}O →
C_{6}H_{12}O_{6} + 6 O_{2}

14. How many
moles of nitrogen gas could be formed from 4.8 moles of nitroglycerin (C_{3}H_{5}O_{9}N_{3} ) decomposing by the following reaction?

4 C_{3}H_{5}O_{9}N_{3} (l) → 12 CO_{2}(g) + 10 H_{2}O(l)
+ 6 N_{2}(g) + O_{2}(g)

15. For the
balanced equation shown below, how many grams of O_{2} will be
produced, if 44.0 grams of N_{2} are produced? 2N_{2}O→2N_{2}+O_{2}

_{ }

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16. If 63.2 g of lithium oxide is decomposed, how many grams of oxygen will be formed? (You will have to write your own equation.)