Question

the no of moles of sodium oxide in 620gm of it

Answer 1

hi friend,

sodiumoxide=Na2O
weight of molecules=46+16=62
1 mole=62gm of Na2O
10 mole=620 gm of Na2O

hope it helps

Answer 2

There are 15.50 moles of ‘sodium oxide’ in 620g of sodium oxide.

Given:

Mass of sodium oxide = 620 g

Molar mass of sodium oxide = 39 g/mol  

Since number of moles is the ratio of mass and molar mass. Molar mass is the ‘sum of atomic masses’ of elements present in the given compound.  

Number of moles  =  Mass / molar mass

Plug the values in the given formula:

Number of moles $=\frac{620\ \mathrm{g}}{39.99\ \mathrm{g} / \mathrm{mol}}$

$=15.50\ moles$