Question

when 1 gm of unhydrous oxalic acid is burnt at 25 centigrade the amount of heat liberated is 2.835 kj.।।​

Answer 1

Answer:

255.23 KJ/mole.

Explanation:

So, Heat of combustion of a substance is actually the heat

which is liberated when 1 mole of substance undergoes the full and complete combustion

with the help of oxygen while pressure is kept constant.

So Molar mass o anhydrous oxalic acid( C2H2O4) is equals to 90.03

g/mole

In the question it I mentioned that 1 g oxalic acid  combustion at 25 degree celsius gives heat  = 2.835 KJ

Thus, 90 g oxalic acid combustion at 25 degree celsius will

liberat heat =  2.835 * 90.03 = 255.23 KJ/mole

(delta H)

i hope it helps you and if any doubt, do let me know!

please mark as brainliest!! :)

Answer 2

1 gm == 2.835...

90 gm == ???

= 90 × 2.835 / 1

= - 255.15 kJ.........thank u❤❤❤