(a) A gas cylinder contains 24 × 1024 molecules of nitrogen gas. If Avogadro's number is 6 × 1023 and the relative atomic mass of nitrogen is 14, calculate:(i) Mass of nitrogen gas in the cylinder.(ii) Volume of nitrogen at STP in dm3.(b) 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? The equation for the reaction isNaCl + AgNO3 → AgCl + NaNO3.[Relative molecular mass of NaCl = 58; AgCl = 143](c) A certain gas 'X' occupies a volume of 100 cm3 at S.T.P. and weighs 0.5 g. Find its relative molecular mass.

(a) A gas cylinder contains 24 × 1024 molecules of nitrogen gas. If A

1.	(a) A gas cylinder contains 24 × 1024 molecules of nitrogen gas. If Avogadro's number is 6 × 1023 and the relative atomic mass of nitrogen is 14, calculate:(i) Mass of nitrogen gas in the cylinder.(ii) Volume of nitrogen at STP in dm3.(b) 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? The equation for the reaction isNaCl + AgNO3 → AgCl + NaNO3.[Relative molecular mass of NaCl = 58; AgCl = 143](c) A certain gas 'X' occupies a volume of 100 cm3 at S.T.P. and weighs 0.5 g. Find its relative molecular mass.
Answer» (a) A gas cylinder contains 24 × 10²⁴ molecules of nitrogen gas. If Avogadro's number is 6 × 10²³ and the relative atomic mass of nitrogen is 14, calculate: (i) Mass of nitrogen gas in the cylinder. (ii) Volume of nitrogen at STP in dm³. (b) 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? The equation for the reaction is NaCl + AgNO₃ → AgCl + NaNO₃. [Relative molecular mass of NaCl = 58; AgCl = 143] (c) A certain gas 'X' occupies a volume of 100 cm³ at S.T.P. and weighs 0.5 g. Find its relative molecular mass.

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