184
Stoichiometry II: Calculations Based on Chemical Equations
(g) C 7 H 16 + 0 2 -^ C0 2 + H 2 0
(h) H 3 P0 3 ± H 3 P0 4 + PH 3
(i) MnO 2 + KOH + O 2 -^ K 2 MnO 4 + H 2 O
(j) KMnO 4 + H 2 SO 4 -* K 2 SO 4 + Mn 2 O 7 + H 2 O
(k) CO + Fe 3 0 4 4. FeO + CO 2
(I) ZnS + O 2 ± ZnO + SO 2
23. Some common gases may be prepared in the laboratory by reactions represented by the following equations. A A sign indicates that heating is necessary. For purity, air must be swept out of the apparatus before the gas is
collected, and some gases must be dried with a suitable desiccant.
2NaHSO 3 + H 2 SO 4 ^ 2SO 2 + 2H 2 O + Na 2 SO 4
MnO 2 + 4HC1 -A. Cl 2 + MnCl 2 + 2H 2 O
2Na 2 O 2 + 2H 2 O -^ 4NaOH + O 2
SiO 2 + 2H 2 F 2 -> SiF 4 + 2H 2 O
2HCOONa + H 2 SO 4 ^» 2CO + 2H 2 O + Na 2 SO 4
__NH 4 C1 + NaNO 2 -^ N 2 + NaCl + 2H 2 O
2Al + 2NaOH + 2H 2 O -> 2NaAlO 2 + 3H 2
Al 4 C 3 + 12H 2 O -> 3CH 4 + 4A1(OH) 3
(a) What weight of NaHSO 3 is needed to prepare (/) 1. 30 moles of SO 2 ? (H)
2.00 Ib of SO 2 ?
(b) How many moles of pyrolusite, MnO 2 , are needed to prepare (/) 100 g of
C1 2 ? (H) 2.60 moles of C1 2 ?
(c) How many pounds of sand, SiO 2 , are needed to prepare 10.0 Ib of SiF 4 ,
assuming that 25% of the sand is inert material and does not produce
SiF 4 ?
(d) How many grams of sodium formate, HCOONa, are needed to make
0.250 mole of CO?
(e) How many pounds of aluminum hydroxide are produced along with 12.0
moles of CH 4 (methane)?
(f) How many moles of NH 4 C1 are needed to prepare 1.33 moles of N 2 by the
sixth reaction?
(g) How many grams of 90% pure Na 2 O 2 (sodium peroxide) are needed to
prepare 2.50 Ib of O 2 ?
(h) Commercial sulfuric acid that has a density of 1.84 g/ml and is 95% H 2 SO 4
by weight is used for the production of CO by the fifth reaction. (/) What
weight of commercial acid is needed for the production of 560 g of
CO? (//) What volume of acid is needed for the production of 560 g of
CO?
(i) What volume of commercial HC1 (36% HC1 by weight, density = 1.18
g/ml) and weight of pyrolusite (85% MnO 2 ) are needed to produce 5.00 kg
of C1 2 by the second reaction?
(j) Commercial sulfuric acid that has a density of 1.52 g/ml and is 62% H 2 SO 4
by weight is used for the production of SO 2 by the first reaction. What (/)
Stoichiometry II: Calculations Based on Chemical Equations
(g) C 7 H 16 + 0 2 -^ C0 2 + H 2 0
(h) H 3 P0 3 ± H 3 P0 4 + PH 3
(i) MnO 2 + KOH + O 2 -^ K 2 MnO 4 + H 2 O
(j) KMnO 4 + H 2 SO 4 -* K 2 SO 4 + Mn 2 O 7 + H 2 O
(k) CO + Fe 3 0 4 4. FeO + CO 2
(I) ZnS + O 2 ± ZnO + SO 2
23. Some common gases may be prepared in the laboratory by reactions represented by the following equations. A A sign indicates that heating is necessary. For purity, air must be swept out of the apparatus before the gas is
collected, and some gases must be dried with a suitable desiccant.
2NaHSO 3 + H 2 SO 4 ^ 2SO 2 + 2H 2 O + Na 2 SO 4
MnO 2 + 4HC1 -A. Cl 2 + MnCl 2 + 2H 2 O
2Na 2 O 2 + 2H 2 O -^ 4NaOH + O 2
SiO 2 + 2H 2 F 2 -> SiF 4 + 2H 2 O
2HCOONa + H 2 SO 4 ^» 2CO + 2H 2 O + Na 2 SO 4
__NH 4 C1 + NaNO 2 -^ N 2 + NaCl + 2H 2 O
2Al + 2NaOH + 2H 2 O -> 2NaAlO 2 + 3H 2
Al 4 C 3 + 12H 2 O -> 3CH 4 + 4A1(OH) 3
(a) What weight of NaHSO 3 is needed to prepare (/) 1. 30 moles of SO 2 ? (H)
2.00 Ib of SO 2 ?
(b) How many moles of pyrolusite, MnO 2 , are needed to prepare (/) 100 g of
C1 2 ? (H) 2.60 moles of C1 2 ?
(c) How many pounds of sand, SiO 2 , are needed to prepare 10.0 Ib of SiF 4 ,
assuming that 25% of the sand is inert material and does not produce
SiF 4 ?
(d) How many grams of sodium formate, HCOONa, are needed to make
0.250 mole of CO?
(e) How many pounds of aluminum hydroxide are produced along with 12.0
moles of CH 4 (methane)?
(f) How many moles of NH 4 C1 are needed to prepare 1.33 moles of N 2 by the
sixth reaction?
(g) How many grams of 90% pure Na 2 O 2 (sodium peroxide) are needed to
prepare 2.50 Ib of O 2 ?
(h) Commercial sulfuric acid that has a density of 1.84 g/ml and is 95% H 2 SO 4
by weight is used for the production of CO by the fifth reaction. (/) What
weight of commercial acid is needed for the production of 560 g of
CO? (//) What volume of acid is needed for the production of 560 g of
CO?
(i) What volume of commercial HC1 (36% HC1 by weight, density = 1.18
g/ml) and weight of pyrolusite (85% MnO 2 ) are needed to produce 5.00 kg
of C1 2 by the second reaction?
(j) Commercial sulfuric acid that has a density of 1.52 g/ml and is 62% H 2 SO 4
by weight is used for the production of SO 2 by the first reaction. What (/)