Question

The crystalline salt Na2SO4.xH2O on heating losses 55.9% of its weight. The formula of the crystalline salt is 

Solution

Correct option is

Na2SO4.10H2O

 

44.1 g of anhydrous Na2SO4 are associated with H2O = 55.9 g

Molar mass of anhyd. Na2SO4

               

SIMILAR QUESTIONS

Q1

What is the concentration of sugar if its 20 g are dissolved in enough water to make a final volume up to 2 L?

Q2

If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?

Q3

What will be the mass of one12C atom in g?

Q4

What is the mass in grams of one molecule of caffeine (C8H10N4O2)?

Q5

What is the equivalent weight of KH(IO3)2 as an oxidant in presence of 4.0 (N) HCl when ICI becomes the reduced from?

Q6

Calculate the molar mass of water if it contains 50% heavy water (D2O).

Q7

 

An element X has the following isotopic composition:

                            200X : 90%

                            199X : 8.0%

                            202X : 2.0%

The weight average atomic mass of the naturally occurring element X is closest to :

Q8

 

 In the reaction,

      2 Al(s) + 6 HCl (aq) → 2 Al3+(aq) + 6 Cl (aq) + 3 H2 (g)

Q9

10 litres of O2 gas is reacted with 30 litres of CO at STP. The volume of each gas present at the end of the reaction are

Q10

0.3 g of an acid is neutralised by 40 cm3 of 0.125 N NaOH. Equivalent mass of the acid is