30 pts
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1. a 15.0 gram sample of a compound...
Chemistry, 15.01.2020 15:31 binodkharal2048
30 pts
show all work and box in your answers.
1. a 15.0 gram sample of a compound is found to contain 8.83 grams of sodium and 6.17 grams of
sulfur. calculate the empirical formula of this compound.
2. analysis of a 10.150 gram sample of a compound known to contain only phosphorus and oxygen
indicates a phosphorus content of 4.433 grams. what is the empirical formula of this compound?
3. a compound is found to contain 36.48%na, 25.41% s, and 38.11% o. find its empirical formula.
4. a compound is found to contain 63.52% iron and 36.48% sulfur. find its empirical formula.
5. qualitative analysis shows that a compound contains 32.38%sodium, 22.65% sulfur and 44.99 %
oxygen. find the empirical formula of this compound.
6. analysis of a 20.0 gram sample of a compound containing only calcium and bromine indicates that
4.00 grams of calcium are present. what is the empirical formula of the compound formed?
7. a 60.00 gram sample of tetraethyl lead, a gasoline additive, is found to contain 38.43grams of
lead, 17.83 grams of carbon, and 3.74 grams of hydrogen. find its empirical formula.
8. determine the molecular formula for the compound with empirical formula p2o5 and molar mass of
284 g/mol.
9. determine the molecular formula for the compound with empirical formula ocncl and molar mass
of 232.41 g/mol.
10. a compound is found to be 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. its molar mass is
60.0 g/mol. what is its molecular formula?
11. a compound is 64.9%carbon, 13.5% hydrogen and 21.6% oxygen. its molar mass is 74.0 g/mol.
what is its molecular formula?
12. a compound is 54.5% carbon, 9.1% hydrogen and 36.4% oxygen. its molar mass is 88.0 g/mol.
what is its molecular formula?
Answers: 1
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