How many grams of O2 are produced as 0.033 mol of water decompose

Answer: This can be quickly solved with "traintracks"

Explanation:

You start w / grams of water and want to find moles of oxygen gas produced.

So you want to Convert:

Grams of water - > moles of water - > moles of oxygen gas.

The two things you need to know to set up the tracks are:

1) Molar mass of water - H2O

Hydrogen - 1.008 (x2)

Oxygen - 16.00

Water - 18.016