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40% by mass urea is obtained by dissolving 190 gof urea in certain amount of water. The mass of amount of water used is

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285 g

105 g

145 g

200 g

answer is C.

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Detailed Solution

The mass of element present in the grams for every 100 g of the total mass of the mixture is called as mass percentage.

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Given: mass percentage of urea is 40%

Mass of urea used is 190 g

Let the mass of water used be x

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Mass of solution will be the sum of urea and water, Question Image

Substituting the values,

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Solving for x

285 g

Therefore, 285 gof water is needed to make 40%by mass urea solution and the correct option is C.

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