Common salt obtained from sea-water contains `8.775% Na Cl` by mass. The number of formula units of `NaCl` present in `25 g` of this salt is :

The fixed number of water molecules present in one formula unit of a salt is known as____

Common salt is crystalline .But the salt prepared from sea water is wetted .Why ?

A solution contains 50 g of common salt in 150 g of water. Mass percentage of solution is

Name the four chemicals that are obtained from common salt and write their molecular formulae.

When we concept that one mole of a substance contains the same numbers of elementary entities or one mole of any other substance, we don’t actually need to know what that number is. Sometimes however we will need to work with the actual number of elementary entities in a mole of substance. This number is called Avogadro.s number. N_(A)=6.022137xx10^(23) molecules The unit mol^(-1) which we read as per mole signifies that a collection of N_(A) molecular level entities is equivalent to one mole at the macroscopic level. For example a mole of carbon contains 6.02xx10^(23) atoms of C. A mole of oxygen gas contains 6.02xx10^(23) molecules of O_(2) . The number of atoms present in 8 g of ozone is

A solution contain 50 g of a common salt in 200 g of water. Calculate the concentration in terms of mass by mass percentage of the solutions.