Chemistry

A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon?

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  1. Calculate the Empirical Formula given 16.37% H and (100-16.37)% C. Refer to Example #2.

    http://www.chem.tamu.edu/class/majors/tutorialnotefiles/empirical.htm

    Use PV=nRT.
    n=mass/molar mass
    units: P=atm, V=L, T=K
    R=0.08206 atm*L/mol*k

    Solve for molar mass and calculate the Molecular Formula.

    http://chemistry.about.com/od/workedchemistryproblems/a/Molecular-Formula-Simplest-Formula-Example-Problem-1.htm

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