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1. Convert 6.32 mg to grams.

6.32 mg x 1g/1000 mg = 0.00632 g

2. Determine the molar mass for CCl4.

The molar mass is 153.82g/mol (Wikipedia)

3. Convert given mass to moles using the molar mass.

0.00632 g CCl4 x 1 mol CCl4/153.82 g CCl4 = 4.11 x 10^-5 mol CCl4

4. Convert moles to molecules.

One mole of molecules is 6.022 x 10^23 molecules.

4.11 x 10^-5 mol CCl4 x 6.022 x 10^23 molecules CCl4/mol CCl4 = 2.47 x 10^19 molecules CCl4

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Q: How many molecules of carbon tetrachloride are in 6.32 mg of that compound?
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