Calculate average atomic mass: 25% c-11, 25% c-14

6.25 amu

Explanation:

Data Given:

Abundance of C-11 = 25 % = 0.25

mass of carbon-11 = 11 amu

Abundance of C-14 = 25 % = 0.25

mass of carbon-14 = 14 amu

Average atomic mass = ?

Solution:

formula used to check average atomic mass is as under

                          Average atomic mass = m₁A₁ + m₂A₂

Where

m₁ and m₂ = mass of isotope 1 and 2 respectively

A₁ and A₂ = abundance or fraction of isotope 1 and 2 respectively

Put values in above formula

                   Average atomic mass = (11 amu)(0.25) + (14 amu)(0.25)    

                   Average atomic mass = 2.75 + 3.5

                   Average atomic mass = 6.25 amu

So

Average atomic mass of 25% C-11, 25% C-14 = 6.25 amu

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

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