Based on what basis the elements had been arranged in the modern periodic table?
A - The increase in the atomic mass
B – The increase in the atomic number
C - The classification of elements into metals and
nonmetals
D - The classification of elements according to their

"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"

catya your not at all which answer i've seen you do this on another question!

the answer your looking for is c).