An element has three isotopes. Their relative masses are given below. Find out the atomic mass of this element ?
$30.00$ % $= 40.00 a m u$
$50.00$ % $= 41.00 a m u$
$20.00$ % $= 42.00 a m u$

40.90

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41.00

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41.90

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42.20

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42.90

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Solution

The correct option is B $40.90$
The atomic mass of this element is, $\frac{30.00 \times 40.00 + 50.00 \times 41.00 + 20.00 \times 42.00}{30.00 + 50.00 + 20.00} = \frac{1200 + 2050 + 840}{100.00} = 40.90$ amu

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An element has three isotopes. Their relative masses are given below. Find out the atomic mass of this element ?30.00% =40.00 amu50.00% =41.00 amu20.00% =42.00 amu

The correct option is B 40.90The atomic mass of this element is, 30.00×40.00+50.00×41.00+20.00×42.0030.00+50.00+20.00=1200+2050+840100.00=40.90amu

An element has three isotopes. Their relative masses are given below. Find out the atomic mass of this element ?
$30.00$ % $= 40.00 a m u$
$50.00$ % $= 41.00 a m u$
$20.00$ % $= 42.00 a m u$

The correct option is B $40.90$
The atomic mass of this element is, $\frac{30.00 \times 40.00 + 50.00 \times 41.00 + 20.00 \times 42.00}{30.00 + 50.00 + 20.00} = \frac{1200 + 2050 + 840}{100.00} = 40.90$ amu