Question

13 According to the following balanced chemical equation, if you want to generate two moles of H20 how many grams of O2 do you need? 2 H2 + O2 → 2 H2O 1. A) 8 2. B) 16 3. C) 32 4.D) 4

Answer 1

13

2H2 + O2 ------> 2H2O

stoichiometrically, to produce 2moles of H2O one mole of O2 is required

so, to produce 2moles of H2O 1mole of O2 is required

mass = number of moles × molar mass

mass of O2 required = 1mole × 32g/mol = 32g

Therefore,

The answer is C) 32

15)

B) equations " a " and " c " are balanced