Hello all I just need to know if the procedure I'm taking is right.(adsbygoogle = window.adsbygoogle || []).push({});

I need to find energy change of 1.05 Mol of KI(s) given that:

I2(s) → I2(g) : 62.44 KJ/mol

K(s) → K(g) : 180.4 KJ/mol

1/2 I2(g) → I(g) : 138.05 KJ/mol

K+(g) + e− → K(g) : −419 KJ/mol

I−(g) → I(g) + e− : 295.16 KJ/mol

Lattice energy for KI = −649 KJ/mol

I tried adding all the values and then multiplying by 1.05 mol but that doesn't seem to work so then what I did was multiply 1.05 by the lattice energy and then add up all the values but I still am not getting the correct answer. There is a diagram in my text and I followed every step yet am I doing something wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Energy change to form KI(s)

Have something to add?

**Physics Forums | Science Articles, Homework Help, Discussion**