Question

if you burn 25.2 g hydrogen and produce 225 grams water, how much oxygen reacted?

Answer 1

use the law of conservation of mass. hydrogen and oxygen combine to form water. If you know the mass of one reactant, and the total mass of the product, how can you find the mass of the other reactant?

Answer 2

My original thought was that you just double the grams of hydrogen and subtract that from the grams of water. But that seemed too easy and I kept thinking I was way off.

Answer 3

there's no need to double the mass of hydrogen

Answer 4

so it's just 199.8g of Oxygen?

Answer 5

it is

Answer 6

ha. I hate it when problems are SO easy, that you think you're doing something wrong. So with significant figures it would be 200.