What is the number of moles in $36 g$ of $H_{2} O$ ?

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Solution

The relationship between the number of moles of a given substance present in a sample and the mass of the sample is given by the molar mass of the substance.
For any chemical species, you have
molar mass= the mass of exactly 1 mole
Now, water has a molar mass of $18.015 g m o l^{- 1}$ which means that
1 mole of water has a mass of $18.015 g$
$18.015 g m o l^{- 1} = \frac{18.015 g}{1 m o l e H_{2} O}$
so for very $18.015 g$ of waterpresent in your sample, you have
1 mole of water.
This means that your 36-g sample will contain
$36 g . \begin{matrix} \begin{matrix} g i v e n b y t h e m o l a r m a s s o f H_{2} S O_{4}      1 m o l e H_{2} O \end{matrix} 18.015 \end{matrix} = 2.0 m o l e s H_{2} O$
The answer must be rounded to two sig figs, the number of sig figs you have for the mass of water.

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What is the number of moles in 36g of H2O?

What is the number of moles in $36 g$ of $H_{2} O$ ?