Question

What energy is associated with the complete combustion of a `20*g` mass of ethane?

Answer 1

Well the reaction we consider is.....

`C_2H_6(g) +7/2O_2(g) rarr 2CO_2(g) + 3H_2O(l) + Delta`

Explanation:

And this is the subject of MEASUREMENT, not calculation. So you should have quoted some thermodynamic parameters in the question.

Clearly, we can calculate a molar quantity of ethane, `=(20*g)/(30.07*g*mol^-1)=??*mol`......