Question 2
Calculate the formula unit masses of $Z n O, N a_{2} O, K_{2} C O_{3}$ . Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

Open in App

Solution

i) Formula unit mass of ZnO = Atomic mass of Zn + Atomic mass of O
= 65 + 16
= 81 u
ii) Formula unit mass of $N a_{2} O = 2 \times A t o m i c m a s s o f N a + A t o m i c m a s s o f O$
$= 2 \times 23 + 16$
= 62 u
iii) Formula unit mass of $K_{2} C O_{3} = 2 \times A t o m i c m a s s o f K + A t o m i c m a s s o f C + 3 \times A t o m i c m a s s o f O$
$= 2 \times 39 + 12 + 3 \times 16$
= 138 u

Suggest Corrections

Similar questions

Calculate the formula unit masses of ZnO, Na₂O, K₂CO₃, given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

{N a}_{2} O

A t o m i c m a s s o f N a = 23 u, O = 16 u

Z n O

[Z n = 65 u, O = 16 u]

Join BYJU'S Learning Program