Water is 11.2% by mass hydrogen (H). How many kilograms of water would contain 4.8 g of hydrogen?
We (i) simply determine the atomic quantity of hydrogen; and (ii) give a corresponding atomic quantity of water. We get an answer under 0.045 kg.
If there are 4.8 g of hydrogen in an unspecified quantity of water, there are
Given the composition of water,
Thus, mass of water