Question

Calculate molecular weight of ;
1 molecule of potash alum
1 mole of potash alum

Answer 1

Hey there !!

Here’s the solution to your question:

(i) The chemical formula of potash alum is K Al (SO₄)₂.10H₂O
So the molecular weight of 1 molecule of potash alum is 39 + 27 + [ 32 + (16*4)] + 10[( 1*2) + 16 ]
= 438 u

(ii) Molecular weight of 1 mole of potash alum = 438g
[notice that only the units change - “u” to “g”]


Reference for the atomic masses of each element in involved :
K - 39u
Al - 27u
S - 32u
O - 16u
H - 1u


Hope this helps ya ✌️✌️
Have a great day ahead