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JEE Main levelNumerical answerDifficulty 2 of 3mc028

A protein contains $0.28%$ iron by mass (Fe = 56) and each molecule has $4$ iron atoms. Its molar mass is $x \times 1 0^{4} g mo l^{- 1}$ . Find $x$ to two decimal places.

Numerical answer type, tolerance 0.005.

Answer: 8

Per mole of protein, mass of Fe

= 4 \times 56 = 224

g, which is

0.28%

of

M

.

M = 224/0.0028 = 80000

, so

x = 8.00

.

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