5. A 0.8102-g sample of impure Al,(CO,), decomposed with HCI; the liberated CO, was collected on calcium oxide and found to weigh 0.0515 g. Calculate the percentage of aluminum in the sample.

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Chapter1: Chemical Foundations
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Answer for number 5

1. Write an equation showing how the mass of the substance sought can be
converted to the mass of the weighed substance on the right.
Sought
"(a) SO,
(b) Mg
*(c) In
(d) K
"(e) Cuo
Sought
(f) MnCl,
) Pb,O,
(h) U,P,O1
*6) Na,B,O, · 10H,O B,O,
Weighed
Weighed
BaSO,
Mg,P,O,
In,O,
K,PtCl,
Cu,(SCN); () Na,O
Mn,O,
PbO,
P,O,
1NAZN(UO,),(C,H,0), · 6H,0
2. What mass of Cu(IO,), can be formed from 0.650 g of CUSO, · 5H,0?
3. What mass of KIO, is needed to convert the copper in 0.2750 g of CUSO, · 5H,0
to Cu(IO,),?
4. What mass of AgI can be produced from a 0.512-g sample that assays 20.1% AlI,?
5. A 0.8102-g sample of impure AI,(CO,), decomposed with HCI; the liberated CO,
was collected on calcium oxide and found to weigh 0.0515 g. Calculate the
percentage of aluminum in the sample.
6. The hydrogen sulfide in an 80.0-g sample of crude petroleum was removed by
distillation and uncollected in a solution of CdCl,. The precipitated CdS was then
filtered, washed, and ignited to CdSO. Calculate the percentage of H,S in the sample
if 0.125 g of CdSO, was recovered.
7. A 0.2121-g sample of an organic compound was burned in a stream of oxygen,
and the CO, produced was collected ina solution of barium hydroxide. Calculate the
percentage of carbon in the sample if 0.6006 g of BaCO, was formed.
Transcribed Image Text:1. Write an equation showing how the mass of the substance sought can be converted to the mass of the weighed substance on the right. Sought "(a) SO, (b) Mg *(c) In (d) K "(e) Cuo Sought (f) MnCl, ) Pb,O, (h) U,P,O1 *6) Na,B,O, · 10H,O B,O, Weighed Weighed BaSO, Mg,P,O, In,O, K,PtCl, Cu,(SCN); () Na,O Mn,O, PbO, P,O, 1NAZN(UO,),(C,H,0), · 6H,0 2. What mass of Cu(IO,), can be formed from 0.650 g of CUSO, · 5H,0? 3. What mass of KIO, is needed to convert the copper in 0.2750 g of CUSO, · 5H,0 to Cu(IO,),? 4. What mass of AgI can be produced from a 0.512-g sample that assays 20.1% AlI,? 5. A 0.8102-g sample of impure AI,(CO,), decomposed with HCI; the liberated CO, was collected on calcium oxide and found to weigh 0.0515 g. Calculate the percentage of aluminum in the sample. 6. The hydrogen sulfide in an 80.0-g sample of crude petroleum was removed by distillation and uncollected in a solution of CdCl,. The precipitated CdS was then filtered, washed, and ignited to CdSO. Calculate the percentage of H,S in the sample if 0.125 g of CdSO, was recovered. 7. A 0.2121-g sample of an organic compound was burned in a stream of oxygen, and the CO, produced was collected ina solution of barium hydroxide. Calculate the percentage of carbon in the sample if 0.6006 g of BaCO, was formed.
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