How to calculate % mass of an element.

10^(22) atoms of an element X are found to have a mass of 930 mg. Calculate the molar mass of the element 'X'.

10^(22) atoms of an element 'X' are found to have a mass of 531 mg. Calculate the molar mass of the element X.

The oxide of an element contains 32.33 percent of the element and the vapour density of its Chloride is 79. Calculate the atomic mass of the element.

The oxide of an element contains 32.33 percent of the element and the vapour density of its Chloride is 79. Calculate the atomic mass of the element.

Calculate the mass % of different elements present in sodium sulphate (Na2SO4).