Question

What mass of oxygen would form from 2.0 moles of water ​

Answer 1

The reaction of the decomposition of water into oxygen gas and hydrogen is balanced as such:

$2H_{2} O -> 2H_{2} + O_{2}$

Using conversion factors, 2.0 mol H2O is equivalent to 1 mol O2, as per the reaction.

1 mol O2 is equivalent to 32g O2 (1 mol O2 * $\frac{32 g O2}{1molO2}$ )

Answer: 32 g of oxygen.