A common ancestor is an organism that is the O indirect ancestor of two or more different organisms
O direct ancestor of one organism
O direct ancestor of two or more different organisms
indirect ancestor of one organism

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

"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"

you need to stop taking that class