What is the mass of 4.52x10-3moles of c3h8

You have the number of moles n, and the formula for the molecule (which is propane by the way).

The mass can be found using this equation:



Now you need to find the molar mass M of propane.

Using the periodic table you can find molar masses in grams per mole of each element. You'll need the molar masses of C and H (since those are the only different atoms present).




You can break down the formula into its atoms:



And same with the molar masses:



Sub in the values for M of propane.





Finally, use the initial equation for m.




Hope this helps :)

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