Question

How many grams of H2O will be formed when 31.78 mol H2 is mixed with 2.64 mol of O2 and allowed to react to form water according to the reaction below? 2H2 + O2 -----> 2H2O (Note: Determine the limiting reagent first)

1. 7.3 g

2. 286 g

3. 23.6 g

4. 94.6 g

5. 144 g

Answer 1

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From the reaction,2 moles of H₂ will react with 1 mole of O₂ TO GIVE 2 MOLES OF H₂O.

Here in the given question H₂ is 31.78 mol and O₂ is  2.64 mol.As per the equation 1 mole of O₂ needs two moles of H₂ and Oxygen is limted and Hydrogen is excessive(Therefore limiting reagent is Oxygen).

1 mole of O₂ reacts with 2 moles of H₂ and produces 2 moles of H₂O

  2.64 mol of O₂ reacts with 5.28 moles of H₂ and produces 5.28 moles of H₂O.

1 mole of H₂O is 18 gm

5.28 moles of H₂O is 95.04 grams and as per the options,THE NEAREST ANSWER WOULD BE option (D)