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  • Arun has prepared 0.01% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?

Arun has prepared 0.01\% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?
(a) 1.00 g \;of\; NaCl + 100g \;of\; water

(b) 0.11 g \;of \;NaCl + 100 g\; of \;water

(c) 0.01 g \;of\; NaCl + 99.99 g \;of\; water

(d) 0.10 g \;of \;NaCl + 99.90 g \;of\; water

Answers (1)

Answer: C
Solution:
Mass Percent: amount of solute in 100 gram of solution.
Mass percent (%)  =\frac{massofsolute\times100}{massofSolution}
Option a:
Mass percent (%) =\frac{1gram\times100}{1gram+100gram}=0.99
Option b:
Mass percent (%) =\frac{0.11gram\times100}{0.11gram+100gram}=0.1099
Option c:
Mass percent (%)  =\frac{0.1gram\times100}{0.1gram+99.99gram}=0.01
Option d:
Mass percent (%)  =\frac{0.1gram\times100}{0.1gram+99.90gram}=0.1
Hence the correct answer is C.

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