Describe what a mole is,
and what is meant by
a molar solution.

A mole is an amount of a substance that contains 6.022✖️10^22 atoms of that substance

Or

Gram atomic masses,gram formula masses or gram formula masses are called one mole.

Molar solution or molarity is defined as the number of miles of so lutes dissolved per dm^3 of solution

Explanation:

I hope this will help you :)

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"