Question

How many moles of Na, Cl and oxygen are present in 0.1 mole of NaCLO3?
a)0.1,0.2,0.3
b)0.1,0.1,0.3
c)0.3,0.1,0.1
d)1,2,3​

Answer 1

The number of moles of Na , Cl and O atoms are 0.1 , 0.1 and 0.3 respectively. so the correct option is (2).

We have to find the number of moles of Na, Cl and O atoms present in 0.1 mole of NaClO₃.

Concept : If no of moles of a compound chemical formula

$A_xB_yC_z$.

is n, then,

• number of moles of A atoms = n × x
• number of moles of B atoms = n × y
• number of moles of C atoms = n × z

Here, number of moles of NaClO₃ is 0.1.

∴ number of moles of Na atoms = 0.1 × 1 = 0.1

number of moles of Cl atoms = 0.1 × 1 = 0.1

number of moles of O atoms = 0.1 × 3 = 0.3

Therefore the correct option is (b) 0.1 , 0.1 , 0.3.