Answer:
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 [tex]1.008\,\frac{g}{mol}[/tex] and [tex]15.999\,\frac{g}{mol}[/tex], 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:
[tex]M = 1.008\,\frac{g}{mol} + 2\cdot \left(15.999\,\frac{g}{mol} \right)[/tex]
[tex]M = 33.006\,\frac{g}{mol}[/tex]
Finally, the amount of moles contained in 42 grams of ice is:
[tex]n = \frac{m}{M}[/tex]
[tex]n = \frac{42\,g}{33.006\,\frac{g}{mol} }[/tex]
[tex]n = 1.272\,mol[/tex]
1.272 moles are contained in 42 grams of water.
