Question

Can someone tell me why it is calculated with O2 only?
Only this is my doubt. I have solution of problem.​

Answer 1

Answer:

Because 38.55 kJ of heat is absorbed when 6 g of O2 reacts with ClF.

Mass of O2 is given and Molecular mass of O2 is also known.

So, we will calculate Standard enthalpy corresponding to O2.

Answer 2

Answer:

32g of 02?

Explanation:

Because the molar mass if o2 need to be calculated here 16*2=32

So for 32 g of o2 standard enthaply of reaction is 205.6kj