What molar quantity is represented by a #3.90*g# mass of calcium chloride?

Question
Answer 1

For all these problems we take the quotient....#"moles of stuff"="mass of stuff"/"molar mass of stuff"#

#n_"calcium chloride"-=(3.90*cancelg)/(110.98*cancelg*mol^-1)=0.0351*mol#....#
Note the dimensional consistency of the answer (which is why I bothered to put in the dimensions!)...#1/(mol^-1)-=1/(1/(mol))=mol# as required...
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