Chemistry help please?

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cdamprun

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A gaseous sample of a compound has a gas density of 0.977g/L at 710.0 torr and 100 degrees C. What is the molar mass of this compound? If this compound contains only nitrogen and hydrogen and is 87.4% nitrogen by mass, what is the molecular formula of the com pound?

Please Help I have no idea how to do this.
Can you please show math. So I can understand it. Thanks
 
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