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Chromium, which is a lustrous, steel gray and hard metal, has a high melting point. It exists in nature in the form of four isotopes, chromium-50, chromium-52, chromium-53, and chromium-54. The respective relative abundances of these isotopes are 4.35 %, 83.79 %, 9.5 %, and 2.36 %. Find the average atomic mass of chromium.

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52.06

54.75

55.24

53.15

answer is A.

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Detailed Solution

Average atomic mass of chromium

$= \frac{(50 \times 4.35) + (52 \times 83.79) + (9.50 \times 53) + (2.36 \times 54)}{100} = \frac{(217.5 + 4357.08 + 503.5 + 127.44)}{100} = \frac{5205.52}{100} = 52.06$

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