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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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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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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 ...

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