Question #992b4

1 Answer
anor277
Dec 22, 2016

It looks like that the sulfate has the greater molar quantity of the sulfur. We have to find the "molar quantity............"

Explanation:

And to find "molar quantity", we take the quotient, "Mass (g)"/("Molar mass (g"*mol^-1")", and get an answer with units 1/(mol^-1)=1/(1/(mol))=mol as required.............

"Moles of thiocyanate" = (13.4*g)/(97.18*g*mol^-1)=??*mol

"Moles of aluminum sulfate" = 0.067*mol

Because potassium thiocyanate has a formula of KSCN, and aluminum sulfate has a formula of Al_2(SO_4)_3, clearly there are more sulfur atoms in the sulfate, i.e. 3xx0.067*mol versus 0.138*mol. Claro?

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