Calculate the number of oxygen atoms in 29.34 g of sodium sulfate, na2so4 .

The number of oxygen atoms in given mass of sodium sulfate are

Explanation:

To calculate the number of atoms, we first need to find the number of moles of sodium sulfate. the equation used will be:

Molar mass of sodium sulfate  142g/mol

Given mass of sodium sulfate = 29.34g

Putting values in above equation, we get:

In 1 mole of sodium sulfate, 4 moles of oxygen atoms are present.

Number of oxygen atoms present in 1 mole of sodium sulfate will be

So, in 0.206 mol of sodium sulfate, the number of oxygen atoms will be =

Hence, the number of oxygen atoms in given mass of sodium sulfate are

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.