Question

Which ratio would be used to determine how many moles of water are produced by reacting 15 mol of oxygen in excess hydrogen?

2H2 + O2 2H2O

Answer 1

@JFraser

Answer 2

if you're asked about the ratio between OXYGEN and the WATER produced, what are the coefficients between those two?

Answer 3

The answer is 2 mol H2O/1 mol O2 right?

Answer 4

Or is it the other way around?

Answer 5

one mole of oxygen will produce 2 moles of water

Answer 6

Ohh so it's \[\frac{ 1 mol H2O }{ 2 mol O2 }\]

Answer 7

yes

Answer 8

Wait that's not one of my answer choices though....

Answer 9

sorry, you flipped the numbers

Answer 10

it should be \[\frac{1mol O_2}{2mol H_2O}\]

Answer 11

No that's not one of my answer choices either...

Answer 12

then flip the whole thing, and its still the same ratio\[\frac{2mol H_2O}{1mol O_2}\]

Answer 13

\[\frac{ 2 mol H2O }{ 1 mol O2 }\]

Answer 14

oh ok thanks!

Answer 15

a ratio that's "upside down" is still the same ratio

Answer 16

ohhh ok thanks for explaining that!