## Stoichiometry: Moles to Grams (1 of 5) |

Converting from
- Circle and label what you are given and what you are trying to find.
Given: 3.5 moles of H_{2}O. Trying to find: number of grams of H_{2}O. - Find the GFM for the substance (in this case H
_{2}O). For water the GFM is 18.02 g/mol. - Set up the math in the following format:
3.5 moles H_{2}O x 18.02 grams/1 mole H_{2}O - Cancel out units and multiply.
3.5~~moles H~~x 18.02 grams/_{2}O~~1 mole H~~= 3.5 x 18.02 grams = 63.07 grams_{2}O - Check to see if you answer makes sense. Here we know that 1 mole of H
_{2}O is about 20 grams (look at the GFM). So 3.5 moles should be about three times more—a bit over 60 grams. Therefore our answer makes sense.
Remember: when converting moles to grams:
When you are converting between moles and grams you aren't changing the quantities, just the units. If I put one mole of H |
The GFM for water can be written as: |