Question

Pls Explain this problem..

Example 3.2 : Calculate the formula unit
mass of CaCl2


Solution:
Atomic mass of Ca
+ (2 x atomic mass of Cl)
= 40 + 2 x 35.5 = 40 + 71 = 111 u


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Answer 1

Answer:

because the formula unit mass is calculated by adding all its elements masses since it's mixture of both elements and here the Cl has 2 atoms i.e Cl2 so we multiply 2 in Chlorine's atomic mass.

Answer 2

Answer:

We know that,

Atomic mass of Ca= 40 u

Atomic mass of Cl2= 35.5 ×2= 71 u

Now, by adding the atomic mass of these two atoms, we can find the formula unit mass:-

Formula unit mass= Atomic mass of Ca+ Atomic mass of Cl2

= 40+ 71

= 111 u