deriving molecular formula

Cyanogen is a gas which contains 46.2% C and 53.8% N by mass. At a temperature of 25C and a pressure of 750 mm Hg, 1.50 g of cyanogen occupies 0.714 L. What is themolecular formula of cyanogen?
a. CN
b. C2N2
c. C3N4
d. C4N5


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