Use the data given in the following table to calculate the molar mass of naturally occurring argon isotopes:
Isotope       Isotopic molar mass            Abundance
³⁶Ar            35·96755 g mol^–1                   0·337%
³⁸Ar            37·96272 g mol^–1                   0·063%
⁴⁰Ar            39·9624 g mol^–1                     99.600%

142.

What do you mean by Atomic mass unit?

Calculate the volume at STP occupied by:
(i) 16 g of oxygen
(ii) 2·5 moles of CO₂
(iii) 1 × 10²¹ molecules of oxygen.

If 10²¹ molecules are removed from 200 mg of CO₂, then how many moles of CO₂ are left?

Compute the number of moles of aluminium sulphate which contains 10²³ SO₄^–2 ions.

What is the name of the element whose mass of one atom is 4×10^–23. Given Avogadro’s number as 6×10²³.

Explain the terms empirical and molecular formulae of a compound. How are these related to each other?

How will you calculate the empirical formula mass?

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