Question

the no. of moles of carbon dioxide which contain 8 gm of oxygen is:-

Answer 1

The number of moles of carbon dioxide which contain 8 gram of oxygen is

8 grams of oxygen will be in (1 x 8)/32 moles of CO2 = 0.25 moles.
1 mole = 6.023 x 1023 molecules.
Thus, 0.25 moles = 6.023 x 1023 x 0.25molecules.
= 1.5 x 1023 molecules contains 8 grams of O2.

Answer 2

in co2
32 g of oxygen combine with 12 g of carbon
1 g of oxygen combine with12/32
8 g combine with12/32×8
=3g
wt og co2= 8+3g
= 11 g
no of mole of co2= given wt/ molecular wt
=11/44
=1/4
=0.25 moles ans.