Question

to obtain 44g of co2 from 16 g of ch4 how much weight of oxygen is needed

Answer 1

Explanation:

as we can see from the attachment, 1 molecule of CH4 needs 2 molecules of oxygen, & molecular weight of oxygen is 32, hence molecular weight of 2 molecules of oxygen will be 64 g.

64 g is the answer

Answer 2

Explanation:

CH4 + 2 O2 -> CO2 + 2 H2O

16g 44g : given

as in equation it says 1 mole of CH4 reacts with 2 mole of O2 to give 1 mole CO2 and 2 mole H2O.

so, the no. of moles of CH4 is

= wt. given/ molecular. mass

= 16/16

= 1 mole

no. of moles of CO2 is

= wt. given/ molecular mass

= 44/44

= 1 mole

Therefore 1 mole CH4 reacts with 2 moles of O2 to give 1 mole CO2.

moles of O2 = wt. given/molecular mass

wt. given = moles × molecular mass

x = 2× 32

= 64 g

Ans :- weight of oxygen needed is 64g.