What is the no. of oxygen atoms in half mole of CO2 gas?
1 Mole of CO2 has 6.023 * 1023 atoms of carbon ad 2*6.023*1023 atoms of oxygen .
So, in half mole of CO2, there are (2*6.023*1023 )/2 atoms of oxygen= 6.023*1023 atoms of oxygen.