Asample of 1.59 grams of z is dissolved into 500 grams of water which is in a styrofoam coffee cup. the temperature is monitored and is found to drop from 23.669◦c to 23.384◦c. what is ∆hsolution for substance z? assume no heat is lost/gained by the cup itself. the specific heat of water is 4.184 j/g· ◦c and the molecular weight of z is 131 g/mol. answer in units of kj/mol of z.

49.27 kJ / mol

Explanation:

moles of Z = 1.59/131 = 0.0121

Energy absorbed by water = mass x heat capacity x temp difference

= 500 x 4.184 x 0.285 J = 596.2

Divide by 1000 to convert J to kJ = 0.5962 kJ

To get value per mole, now divide by no of moles. = 49.27 kJ/mol

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option number c is the right answer.