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

Any help would be appreciated !!

1 Answer
Mar 25, 2018

#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#