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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

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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

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.