Question

When hydrogen gas is burnt in chlorine 2000cals of heat is liberated during the formation of 3.65g of HCl.∆H of formation of HCl is
1)2 K.cal
2)-20 K.cal
3)+20K.cal
4)-2K.cal

Answer 1

the correct answer is ✨✨✨✨

option D ,
4) -2k Cal.

as we know that the enthalpy is just opposite to energy ,, and the energy is given 2000 calorie so then selfie will be just opposite to it - -2000 calorie ..

✌️✌️hope it helps you ✌️✌️

Answer 2

Answer:

Explanation:

1/2H2+1/2Cl2=HCL

One mole of HCL=35.5+1=36.5 grams

3.65 liberates 2000 cal according to question

Then one mole?

2000/3.65*36.5=20Kcal