Question

Calculate mass percentage of all the elements in copper sulphate (CuSO4).give answer with method.​

Answer 1

Answer:

What

Explanation:

Answer 2

Answer:

Explanation:

i) Calculate the mass of the specified element (for its %) in the compound, taking into account the number of atoms of the element in the compound formula

(iii) Calculate (ii) as a percentage of (i)

 

 relative atomic mass of element x number of atoms of element in formula

% element in compound =  

--------------------------------------------------------------------------------------------------------------- X 100

 

                                relative formula mass of the compound

% by mass of Z = 100 x Ar(Z) x atoms of Z / Mr(compound)

It always seems complicated when stated in this formal way, but the calculations are actually quite easy ..

as long as you can correctly read a formula!

Calculation of % composition Example 4a.1

Calculate the % of copper in copper sulphate, CuSO4

Relative atomic masses: Cu = 64, S = 32 and O = 16

relative formula mass = 64 + 32 + (4x16) = 160

only one copper atom of relative atomic mass 64

% Cu = 100 x 64 / 160

= 40% copper by mass in the compound

Note that similarly, you can calculate the % of the other elements in the compound e.g.

% sulfur = (32/160) x 100 = 20% S

% oxygen = (64/160) x 100 = 40% O

Also note that if you haven't made any errors, they should add up to 100%,useful arithmetical !

HOPE IT HELPS

:)