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A compound is 7.75% hydrogen and 92.26% carbon by mass. At 100 degrees Celsius, a 0.6883...

A compound is 7.75% hydrogen and 92.26% carbon by mass. At 100 degrees Celsius, a 0.6883 g sample of the gas occupies 250 mL when the pressure is 820 torr. What is the molecular formula for this compound? Please show work

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