Q33 of 203 Page 173

Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen?

The atomic mass of an element expressed in grams is called gram atomic mass. It is determined by taking the atomic weight for an element on the periodic table and expressing it in gram. Weight in grams is numerically equal to the atomic weight of the element.

The gram atomic mass of oxygen is equal to 16.


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32

What is meant by ‘a mole of carbon atoms’?

 32

Which has more atoms, 50 g of aluminium or 50 g of iron? Illustrate your answer with the help of calculations.

(Atomic masses: Al = 27 u; Fe = 56 u)

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How many moles of oxygen atoms are present in one mole of the following compounds?

(i) Al2O3 (ii) CO2 (iii) Cl2O7


(iv) H2SO4 (v) Al2(SO4)3

 34

Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen?