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johnlund2132p0m8y4

Answer:

77.79% nitrogen by mass

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%