Question

1 g of carbon is burnt with 1.5 g of oxygen which reactent is left in 3xcess find mass left unreacted​

Answer 1

To every 1 g of C we need 2 g of O or converse of that.

Here we dont have 2 g of O so we have to take the converse, i.e,

to every 2 g of O we need 1 g of C

2:1

2x:x

1.5:x

2x = 1.5

x = 1.5 / 2 = 0.75

So 0.75 g of C completely reacts with 1.5 g of O

Here C is left in excess, and 1-0.75 = 0.25g of it is left

HOPE THIS HELPS ^_^