Problem: The ΔHf˚ of TiI3(s) is –328 kJ/mol and the ΔH˚ for the reaction Ti(s) + 3 I 2(g) → 2 TiI3(s) for the reaction is –839 kJ{ m kJ}. Calculate the ΔH of sublimation of I2(s), which is a solid at 25˚C.

🤓 Based on our data, we think this question is relevant for Professor Robinson & Ye's class at IU.

FREE Expert Solution
FREE Expert Solution

We are asked to calculate the ΔH of sublimation of I2(s)


 We can use the following equation to solve for ΔH˚rxn:


ΔH°rxn=ΔH°f, prod-ΔH°f, react


Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol. 

Also, note that ΔH˚f for elements in their standard state is 0.


ΔH˚f TiI3(s) = –328 kJ/mol

ΔH˚f Ti(s) = 0 kJ/mol (standard state)



We also need to convert ΔH˚rxn from kJ/mol to J/ mol so our units remain consistent. 


Ti(s) + 3 I 2(g) → 2 TiI3(s)



View Complete Written Solution
Problem Details

The ΔHf˚ of TiI3(s) is –328 kJ/mol and the ΔH˚ for the reaction Ti(s) + 3 I 2(g) → 2 TiI3(s) for the reaction is –839 kJ. Calculate the ΔH of sublimation of I2(s), which is a solid at 25˚C.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofThe ΔHf˚ of TiI3(s) is –328 kJ/mol and the ΔH˚ for the react...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Sabrina took 7 minutes and 12 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Robinson & Ye's class at IU.