Question

How many moles of hydrogen are needed to produce 25.13 g of water?

Any help would be appreciated !!

Answer 1

`1.4` moles

Explanation:

first we need to write a balanced symbol equation of this reaction

`2H_2+O_2=>2H_2O`

then we need to find the moles of water so the equation that we will use is `mol=(mass)/(Mr)`

so as you can see the numbers before the elements in the balanced equation are in the ratios of
`2:1:2`

so `mol=(25.13)/(36)` which equals to `0.7` then `0.7*2=1.4mol`

ratio of hydrogen to water is `2:2` which is `1:1` multiplying `1.4` with `1` gives us `1.4`