chemistry NEED HELP please

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N2(g) + 3H2(g) ==> 2NH3(g)

A. If 16.99 g of hydrogen is reacted at STP, volume of ammonia is produced?

B. If 35.82 L of nitrogen is reacted at STP, what mass of hydrogen must also be reacted?

C. At STP, what volume of hydrogen is needed to produce 70.9 L of ammonia;

D. What volume of nitrogen is needed to produce 0.947 mol of ammonia?

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