ENDOTHERMIC During this chemical reaction energy is absorbed. In the chemistry lab, this would be indicated by a decrease in temperature or if the reaction took place in a test tube, the test tube would feel colder to the touch. Reactions like this one absorb energy because
The reactants have less potential energy than the products.

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Queenbabybunnyboo

10.01.2023

Chemistry

Answer : The average atomic mass of an element is, 268.6 amu.

Solution : Given,

Mass of isotope 1 = 267.8 amu

% abundance of isotope 1 = 87.8% = 0.878

Mass of isotope 2 = 269.9 amu

% abundance of isotope 2 = 12.2% = 0.122

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$\text{ Average atomic mass of an element} Y=\sum[(267.8\times 0.878)+(269.9\times 0.122)$

$\text{ Average atomic mass of an element}=268.06amu$

Therefore, the average atomic mass of an element is, 268.6 amu.

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