What is the mass in grams of 2 molecules of CCl4?

Chemistry
Tutor: None Selected Time limit: 1 Day

Given that the molar mass of carbon tetrachloride, CCl4, is 153.8 g, what is the mass in grams of 2 molecules of CCl4.

Oct 30th, 2015

Thank you for the opportunity to help you with your question!

If the molar mass of CCl4 is 153.8 g/mol then you must multiply this by the amount of moles of CCl4 that one has to find the mass which is in grams.6.02

To do this you must divide the amount of molecules by Avogadro's number (6.022*10^23 molecules/mol).

2 molecules CCl4 / (6.022*10^23 molecules/mol) = 3.321*10^-24 mol

153.8 g/mol * 3.321*10^-24 mol = 5.108*10^-22 g CCl4 which is the answer.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 30th, 2015

Can you please provide more clarification in the first part...I don't understand how to go from 153.8 g/mol of CCl4 and then dividing by Avogadro's number in molecules/mol. How are the grams cancelled out?

Thanks!

Oct 30th, 2015

The grams are not part of the equation at that point. I just needed to convert the amount of molecules of CCl4 into moles. That is so I could multiply by the molar mass and have the moles cancel out just leaving the amount of grams.

Oct 30th, 2015

Thank you!

Oct 30th, 2015

You're welcome

Oct 30th, 2015

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