Question

The hydrated salt Na₂CO₃.x H₂O undergoes 63% loss in mass on heating and becomes anhydrous. The value of x is
(a) 3
(b) 5
(c) 7
(d) 10

Answer 1

Answer:

d) 10

Explanation:

let mass of salt is w

w=106+18x -------(1)

after heating

37w/100=106

w=106×100/37

put the value of w in equation (1)

106×100/37=106+18x

106×63/37=18x

n=10.02

n=10