Short Answer TypeUse 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%
Long Answer TypeCalculate the volume at STP occupied by:
(i)Â 16 g of oxygen
(ii) 2·5 moles of CO2
(iii) 1 × 1021 molecules of oxygen.
 16 g oxygen at STP would occupy volume
Short Answer TypeIf 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.
Long Answer TypeExplain the terms empirical and molecular formulae of a compound. How are these related to each other?
Short Answer TypeCalculate the mass percentage of different elements present in sodium sulphate (Na2SO4).
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