A sample of carbon dioxide (CO2) has a mass of 52.0g. How many oxygen atoms are present?

7.11 x 10²³ atoms of oxygen

Explanation:

Given parameters:

Mass of Carbon dioxide  = 52g

Unknown:

Number of oxygen atoms present = ?

Solution:

To solve this problem, we need to first find the mass of oxygen in the compound.

 Molar mass of CO₂   = 12 + 2(16)  = 44g/mol

 Mass of oxygen  = x 52  = 37.8g

  Number of moles of oxygen  =    =    = 1.18moles

So;

       1 mole of a substance contains  6.02 x 10²³ atoms

1.18 mole of oxygen will contain 1.18 x 6.02 x 10²³ = 7.11 x 10²³ atoms of oxygen

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.