Question

Carbon and oxygen react in ratio of 3 is to 8 by mass to form CO2 what weight of carbon should be used to react completely with 32 gram of oxygen

Answer 1

here u have ratio are given that are 3:8

so,let carbon=3x
let oxygen=8x

therefore,8x=32
x=4g

so,carbon=3x=3×4=12gram

Answer 2

let carbon is 3x and oxygen is 8x

as 8x=32

x=4g

for carbon 3x=12g