Q32 of 203 Page 173

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

A mole of carbon atoms means a carbon sample measuring 12 g and containing 6.022 x 1023 carbon atoms.


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31

Define mole. What are the two things that a mole represents?

 31

What weight of each element is present in 1.5 moles of sodium sulphite, Na2SO3?

(Atomic masses: Na = 23 u; S = 32 u; O = 16 u)

 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)

 33

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