Answer:
77.79% nitrogen by mass
Step-by-step explanation:
1 mole of nitrogen: 14.0067 grams
1 mole of hydrogen: 2 grams
2 moles of nitrogen + 4 moles of hydrogen
28.0134g + 8g = 36.0134g total weight
28.0134 / 36.0134 = 77.79%
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