How many moles of \ce{H2O}HX 2 O will be produced from 42.0 \text{ g}42.0 g42, point, 0, start text, space, g, end text of \ce{H2O2}HX 2 OX 2 ?

1.272 moles are contained in 42 grams of water.

Explanation:

Chemically speaking, ice is the solid form of water and a molecule of water consist of two atoms of hydrogen and an atom of oxygen. Furthermore, atomic masses of hydrogen and oxygen are and , respectively. A mole is the ratio of current mass of water to molecular weight of water, the latter one is now calculated before computing the amount of moles of water:

Finally, the amount of moles contained in 42 grams of ice is:

1.272 moles are contained in 42 grams of water.