Question

2 mole of N2 is reacted with 4 moles of H2 to produce ammonia . Mass of ammonia produced is

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Answer 1

1 Mole of nitrogen(N2) weighs 14*2= 28 g
2 moles of nitrogen(N2) weighs 56 g
1 Mole of H weighs 1g
4 moles of H2 weigh 1*4*2=8 g
Total mass before reaction= 56+8=64g
Total mass before a chemical reaction is equal to the total mass after chemical reaction by the laws of conservation of mass.
Therefore mass of ammonia produced is 64 g