Question

how many moles are in 30 grams od water (H2O)

Answer 1

To calculate the number of moles in 30 grams of water (H₂O), you can use the formula:

\[
\text{Number of moles} = \frac{\text{mass (grams)}}{\text{molar mass (g/mol)}}
\]

First, find the molar mass of water (H₂O):

- Hydrogen (H) has a molar mass of about 1.01 g/mol, and there are 2 hydrogen atoms:
\[
2 \times 1.01 \, \text{g/mol} = 2.02 \, \text{g/mol}
\]

- Oxygen (O) has a molar mass of about 16.00 g/mol.

Now, add the masses together to get the molar mass of water:
\[
\text{Molar mass of H₂O} = 2.02 \, \text{g/mol} + 16.00 \, \text{g/mol} = 18.02 \, \text{g/mol}
\]

Next, use this molar mass to calculate the number of moles in 30 grams of water:
\[
\text{Number of moles} = \frac{30 \, \text{grams}}{18.02 \, \text{g/mol}} \approx 1.66 \, \text{moles}
\]

So, there are approximately **1.66 moles** of water in 30 grams.