Question

Determine the number of moles of the anhydrous salt present after heating, assuming that the contents of the aluminum cup after heating are pure anhydrous KAl(SO 4 ) 2 .

Answer 1

0.2 moles, assuming weight of dried salt

Step-by-step explanation:

In order to determine the number of moles, we need to be aware of the mass of the substance in question.

Assuming the mass of the dehydrated
`KAl(SO_(4) )_(2).H_(2) O` is 50g.

No. of moles = mass of substance/ molar mass of the substance.

=
`(50g)/(39+27+32*2+16*4*2\\)g/mol)`

= 0.2 moles moles.