Chemical analysis of a gaseous compound showed that it contained 75

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Chemical analysis of a gaseous compound showed that it contained 75.0 percent carbon (C) and 25.0 percent hydrogen (H) by mass. :

At 200°C, 97.2 L of the compound exerted a pressure of 0.74 atm.

If the mass of 97.2 L of the compound was 30.1 g, calculate the molecular formula of the compound. (Molar mass of C is 12 g/mole, molar mass of H is 1 g/mole) (8 Puan)

1) CH₄       2) C₂H₈      3) C₃H₁₂    4) C₄H₁₆

Options

i) 1

ii) 2

iii) 3

iv) 4