Question

Hydrated sodium carbonate weighting 4g,contains 2.52g of water of crystallisation.The formula of hydrated salt is

Answer 1

Hey buddy,

# Answer = Na2CO3.10(H2O).


# Explanation
Let's consider hydrated salt of sodium carbonate with x water of crystallization. Then molecular formula will be Na2CO3.x(H2O).
Let's assume m moles of Na2CO3, then xm moles of water.

Weight of sodium carbonate only=1.48g
Molecular mass of sodium carbonate = 2×23+12+3×16 = 106
Moles of sodium carbonate m = 1.48/106 ...(1)

Weight of water only=2.52g
Molecular mass of water = 2×1+16 = 18
Moles of water xm = 2.52/18 ...(2)

Putting (1) in (2),
x(1.48/106)=2.52/18
x = 2.52×106/1.48×18
x = 10

Thus, hydrated salt contains 10 water of crystallization.
y=1.48g
Molecular mass of sodium carbonate = 2×23+12+3×16 = 106
Moles of sodium carbonate m = 1.48/106 ...(1)

Weight of water only=2.52g
Molecular mass of water = 2×1+16 = 18
Moles of water xm = 2.52/18 ...(2)

Putting (1) in (2),
x(1.48/106)=2.52/18
x = 2.52×106/1.48×18
x = 10

Thus, hydrated salt contains 10 water of crystallization with formula Na2CO3.10(H2O).

...

Answer 2

Answer:

the answer is AXH2

hope it helps you