# Chem Urgent!

posted by Lisa

How do I determine the number of moles for the substance: 3.5 x 10^23 molecules H2O?

1. DrBob222

1 mol of anything has 6.02 x 10^23 molecules of (in this case) H2O. This must be close to a 0.5 mol but you need to do the exact arithmetic.

2. Lisa

How do I determine the number of grams for the following Substance? 7.8 mol ZnSo4.

3. Anymous

How do I determine the number of grams for the following Substance? 7.8 mol ZnSo4

4. DrBob222

grams = mols x molar mass

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