Question

I didn't understand the 3rd step of question 2

Answer 1

there given the weight of carbon is 3g and it is burnt in oxygen then the product is 11g of carbon the had find out the sum then the product is 11grams

Answer 2

Its Unitery method,

In the given solution a step has been skipped.
I'll fill the missing statement from the statement 2 to 3.

2) 12 g of C reacts with 32g of O2

Then, 1g of C reacts with 32/12g of O2

( this statemwnt is true because....
12 g gives 32 g
or, 12/12 g gives 32/12g
or, 1g gives 32/12g , of C to O2)

3) 1×3 g of C gives 32/12*3g of O2
or, 3g of C gives 8g of O2