The number of grams of ammonia formed when 3.82 grams of hydrogen react with nitrogen according to the equation N2 + 3 H2 → 2 NH3 is:

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No of mol of hydrogen = 3.82/1=3.822 mol of ammonia is formed by 3 mol of hydrogen2.546 mol of ammonia is formed by 3.82mol of hydrogenGrams of ammonia formed = 2.546x(14+3) =43.3grams (3s.f.)