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प्रश्न
Arun has prepared a 0.01% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?
विकल्प
1.00 g of NaCl + 100g of water
0.11g of NaCl + 100g of water
0.0l g of NaCl + 99.99g of water
0.10 g of NaCl + 99.90g of water
उत्तर
0.0l g of NaCl + 99.99g of water
Explanation:
Mass % = `(Mass of solute)/(Mass of solute + Mass of solvent) xx 100`
(a) Mass percentage = `1.00/(1.0 + 100 xx 100)`
= 0.99
(b) Mass percentage = `0.11/(0.11 + 100) xx 100`
= 0.1098
(c) Mass percentage = `0.01/(0.01 + 99.99) xx 100`
= 0.01
(d) Mass percentage = `0.10/(0.10 + 99.90) xx 100`
= 0.1
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