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

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current