Question

1.

a. The compound X₃Y is 35.0% X. What is the molar mass of Y if the molar mass of X is 62.4 g/mol?

b. What is the atomic mass of element X if 9.94 g XCl₃ contains 3.26 g X?

c. A 2.953-g sample of an oxide of V contains 1.654 g V. What is the empirical formula of the oxide?

d. What is the empirical formula of a hydrocarbon if complete combustion or 6.900 mg of the hydrocarbon produced 22.738 mg of CO₂ and 6.205 mg of H₂O? Be sure to write C first in the formula.

empirical formula =

What is the molecular formula if the molar mass of the hydrocarbon is found to be about 120

molecular formula =