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Mr. Parker consumes 1 kg of bread on average everyday. Bread contains 10% by mass of protein. Protein contains 7% by mass of nitrogen. If 10% of nitrogen present in
protein is converted to urea, how much urea is produced in Mr. Parker in one day?

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750 mg

70 mg

1500 mg

150 mg

answer is C.

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Detailed Solution

1 kg - 1000 g
The total nitrogen present in 1 kg bread

$= 1000 \times \frac{10}{100} \times \frac{7}{100} g$

$∴$ N converted to urea everyday

$= 1000 \times \frac{10}{100} \times \frac{7}{100} \times \frac{10^{}}{100} g$

= 0.7 g

28 g N yields 60 g urea

$∴ 0.7 gN yields \frac{60}{28} \times 0.7 g urea$

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