(c) (i) A gas cylinder contains 24 x 1024 molecules of
nitrogen gas. If Avogadro's number is 6 x 1023
and the relative atomic mass of nitrogen is 14,
calculate :
(1) Mass of nitrogen gas in the cylinder
(2) Volume of nitrogen at STP in dm.
(ii) Commercial sodium hydroxide weighing 30 g has
some sodium chloride in it. The mixture on
dissolving in water and subsequent treatment with
excess silver nitrate solution formed a precipitate
weighing 14.3 g. What is the percentage of sodium
chloride in the commercial sample of sodium
hydroxide ?
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Answer:Answer:
i 1) 1120g
i 2) 896 Litres
Explanation:
(i) 6*10²³ molecules of N2 weighs 2*14 = 28g
Therefore 24 * 10²⁴ molecules weigh=
28* 24*10²⁴÷ 6*10²³ = 1120 g
N molecules occupy 22.4 litres at S.t.p
Therefore 24*10²⁴ molecules occupy
22.4*10²⁴*24÷ 6*10²³ = 896 litres
Explanation:
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