Find the wt of water present in 1.61 g of `Na_(2)SO_(4).10H_(2)O`

Amount of oxygen in 32.2 g of Na_(2)SO_(4).10H_(2)O is:

Na_(2)b_(4)O_(7)10H_(2)O is

Calculate the mass of oxygen in grams present in 0.1 mole of Na_(2)CO_(3).10H_(2)O

How many atoms of each type present in 143 g of washing soda (Na_(2)CO_(3).10H_(2)O) ?

How many water molecules of crystallisation are present in borax, Na_(2)B_(4)O_(7).10 H_(2)O ?

At what relative humidity with Na_(2)SO_(4) be deliquescent (absorb moisture) when exposed to the air at 0^(@ )C ? Given Na_(2)SO_(4).10H_(2)O(s) hArr Na_(2)SO_(4)(s) +10H_(2)O(g), K_(p)=4.08xx10^(-25) and vapour pressure of water at 0^(@)C =4.58 Torr ?