If you have 100 grams of water, how many grams of elemental hydrogen do you h

O 1800 grams

11.2 grams

11.2 g

Explanation:

Given dа ta:

Mass of water = 100 g

Mass in grams of hydrogen = ?

Solution:

Number of moles of water:

Number of moles = mass / molar mass

Number of moles = 100 g / 18 g/mol

Number of moles = 5.6 mol

It is known that one mole of water contain two elemental hydrogen.

Thus in 5.6 moles,

5.6 * 2 = 11.2 mol

Mass of hydrogen:

Mass = number of moles * molar mass

Mass = 11.2 mol * 1 g/mol

Mass = 11.2 g