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Question

(i) Calculate the mass of 3.011 x 1023 nitrogen molecules.
(ii) How many moles are 12.044 x 1023 atoms of He?


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Solution

(i) Mass of nitrogen molecules=
Number of moleculesAvogadro number×Molar massMass (m) of nitrogen molecules=3.011×10236.022×1023×28 =14g(i) No of Moles=Number of moleculesAvogadro number =12.044×10236.022×1023=2mole of atom

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