Question

How many moles are present in 9.15 grams of h2o

Answer 1

First, find the molar mass of H2O. It may vary depending on your source. Use the source your teacher gave you.

I got 18.015 g/mol as the molar mass of water.

Then you basically do some math to figure out the amount of moles...

9.15 grams × (1 mole H2O)/(18.015 grams H2O) = .5079

There is approximately .51 moles present.