Question

You need solutions of concentration 2 mol/ dm',
with 10 g of solute in each. What volume of
solution will you prepare, for each solute below?
(A,: H= 1, Li = 7, N = 14, 0 = 16, Mg = 24,
S= 32.)
a lithium sulfate, Li,SOA
h
magnesium sulfate, MgSO,
C
ammonium nitrate, NH,NO,

Answer 1

Here is how you do Li2SO4. The others follow the same pattern.
2*Li = 2*6.9 13.8
S = 32
O = 4*16 = 64
13.8 + 32 + 64 = 109.8
moles in 10 g = 10/109,8 = 0.091
M = moles/dm^3 or dm^3 = moles/M = 0.091 moles/2 = ? dm^3 = ? L.
The others are done the same way.