# Calculating the Number of Molecules Present in a Sample

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I need to calculate the number of molecules present in:

(a) 0.650 mol propane, C3H8, a gas used in laboratories

(b) a 500mg tablet of CaCO3, an antacid

https://brainmass.com/chemistry/stoichiometry/calculating-number-molecules-present-sample-25530

#### Solution Preview

a.

There are 6.022x10^23 molecules of "chemical X" in a mole of "chemical X" (in this case "chemical X" is propane).

"Mole" is just a number.

you have 0.650 mol of propane times 6.022x10^23 molecules per mole

= 3.91x10^23 molecules

b.

For the next one, you need to convert ...

#### Solution Summary

The solution talks through the problem by way of explaining how to determine the number of molecules present in the two given samples.

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