Question

If 100 cm3 of oxygen reacts with 30 cm3 of methane in the following reaction, how much oxygen will be left at the end of the reaction?

CH4(g)+2O2(g) → CO2(g)+2H2O(l)

Answer 1

If it's liquid, this is the total volume:300+100= 400 cm3

Step-by-step explanation:

CH4 + 2O2 –––> CO2 + 2 H2O

100 . . 500. . . . . . 0 . . . . . .0. . . (initial)

100. . . 200 . . . 100 . . . . .200 . . (reaction)

0. . . . 300 . . . 100 . . . . . 200 . .(final)

H2O can be either gas or liquid. If it is gas, this is the total volume of gases : 300 + 100 + 200 = 600 cm3

If it's liquid, this is the total volume:300+100= 400 cm3