What mass in kilograms of water would have to be electrolyzed to produce 902 kgkg (one ton) of hydrogen?

Answer : The mass of water would be, 8118 kg

Explanation : Given,

Mass of = 902 kg = 902000 g

Molar mass of = 2 g/mole

The electrolysis reaction of water is:

First we have to calculate the moles of .

Now we have to calculate the moles of

From the balanced chemical reaction we conclude that,

As, 2 moles of produced from 2 moles of

So, 451000 moles of produced from 451000 moles of

Now we have to calculate the mass of

Molar mass of = 18 g/mol

Thus, the mass of water would be, 8118 kg

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)