How many molecules are in a sample of water with a mass of 44.99 grams?

1 Answer
anor277
Apr 3, 2016

(44.99*g)/(18.01*g*mol^-1) xx N_A, where N_A = "Avogadro's number "6.022xx10^23*mol^-1.

Explanation:

By definition 1 mole of water has a mass of 18.01*g. And in such a mass there are N_A water molecules.

The problem quotes a certain mass; we convert this to moles, and from this we get the number of molecules.

How many atoms are there in such a sample?

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