Calculating moles and molecular mass

A steel bottle of 4.00 liters, initially evacuated, is filled with 4.00 grams of a pure gas. The bottle has an absolute pressure of 1.5375 Standard Atmospheres when the temperature is 300 Kelvin. R=0.0820 liter atm/mole K.

1) How many moles of gas does the bottle contain?

2) What's the molecular weight (in grams) of the mass?

3) If the gas is a hydrocarbon compound known to be a member of the paraffin series, CnH2n+2, what is the chemical formula of the compound?

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...r of moles of the gas.
<br>2) Since the number of moles of the gas are known and you know that this is 4 grams of gas. You can calculate the molecular weight of the gas. The molecular weight is the weight of 1 mole of the substance. This means that the molecular weight is 4 grams ...