How many grams would #6.8 * 10^23# formula units of #CuCl_2# be?

1 Answer
May 4, 2016

Answer:

The mass of #6.8xx10^23# formula units #"CuCl"_2"# is #~~150# g.

Explanation:

Convert the given formula units of #"CuCl"_2"# to moles by dividing by #6.022xx10^23# formula units/mol, then determine the mass of #"CuCl"_2"# by multiplying the moles of #"CuCl"_2"# by its molar mass.

#1 "mol formula units"=6.022xx10^23 "formula units"#

The molar mass of #"CuCl"_2="134.452 g/mol"#.
https://pubchem.ncbi.nlm.nih.gov/compound/24014#section=Top

#6.8xx10^23cancel"formula units CuCl"_2xx(1cancel"mol CuCl"_2)/(6.022xx10^23cancel"formula units CuCl"_2)xx(134.452"g CuCl"_2)/(1cancel"mol CuCl"_2)="150 g CuCl"_2"# (rounded to two significant figures)