Question

How many moles are in 5g of Na2CO3?
a) 0.047
b) 1
c) 2
d)21.2​

Answer 1

0.047

Step-by-step explanation:

Data : 5g , Na2CO3

Formula:

Molecular mass of Na2Co3 = no.of atomic mass x no. of atom

moles = mass÷ molecular mass

molecular mass = 2(23)+1(12)+3(16)

=106amu

moles = 5÷106

= 0.047 Ans: