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 .

Question

asked Dec 15, 2021 128k views

1 Answer

Lbstr · Answer 1 · 2021-12-21T09:13:37+0000

Answer:

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.