You have 3.0 Mol of CoCl2. What is the mass of the sample?

1 Answer
Nam D.
Mar 5, 2018

#~~390 \ "g"#

Explanation:

We have #3# moles of #CoCl_2#.

Cobalt(II) chloride has a molar mass of #129.839 \ "g/mol"#. So, #3# moles of this compound would weigh

#3color(red)cancelcolor(black)"mol"*(129.839 \ "g")/(1color(red)cancelcolor(black)"mol")=389.517 \ "g"#

We also have #389.517 \ "g"~~390 \ "g"#.

I've rounded the answer to a whole number, since the number of moles given was also a whole number.

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