Step-by-step explanation:
one mole of ammonia= 6.02 × 10²³
But one mole is 17grams
17 grams = 6.02 × 10²³
1200 grams = (1200 × 6.02 × 10²³) ÷ 17
Answer:
70.5882352941 moles
Moles= Mass/Molar mass
12000/17
= 70.5882352941 moles
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