At its highest salinity, the water in utah’s great salt lake contains about 14.5g of salt in 50g of lake after. what was the salinity of the lake?

the salinity of lake is expressed as mass of salt dissolved in grams per kg of water

Given:

Mass of salt = 14.5g

mass of water =50g = 50 / 1000kg = 0.05kg

Thus salinity will be

salinity = mass of solute / mass of water in kg

salinity = 14.5g / 0.05 kg = 290g / kg

This can also be expressed as parts per thousand or ppt

so salinity is 290 ppt

"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"