The annual production of sulfur dioxide from burning

4. The annual production of sulfur dioxide from burning coal and fossil fuels, auto
exhaust, and other sources is about 26 million tons. The equation for the reaction is
S(s) + O
2
(g) → SO
2
How much sulfur (in tons), present in the original materials, would result in that
quantity of SO
2
? (5 points)
(g)
2
5. Each copper(II) sulfate unit is associated with five water molecules in crystalline
copper(II) sulfate pentahydrate (CuSO
4
⋅
5H
2
O). When this compound is heated in air
above 100 o C, it loses the water molecules are also its blue color:
CuSO
4
⋅
5H
2
O → CuSO
4
+ 5H
2
If 9.60 g of CuSO
4
are left after heating 15.01 g of the blue compound, calculate the
number of moles of water originally present in the compound. (5 points)
O
6. The fertilizer ammonium sulfate [(NH
4
)
2
SO
4
] is prepared by the reaction between
ammonia (NH
3
) and sulfuric acid:
2 NH
3
( g ) + H
2
SO
4
( aq ) → (NH
4
)
2
SO
4
( aq
How many kilograms of NH
3
are needed to produce 1.00 × 10 5 kg of (NH
4
)
2
SO
4
?
(5 points)
)
7. Nitric acid (NO) reacts with oxygen gas to form nitrogen dioxide (NO
2
), a dark
brown gas:
2NO( g ) + O
2
( g ) → 2NO
2
(
In one experiment 0.886 mole of NO is mixed with 0.503 mol of O
2
.
a. Calculate which of the two reactants is the limiting reagent. (5 points)
b. Calculate also the number of moles of NO
2
produced. (5 points)
g )
2
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