When a solid dissolves in water, heat may be evolved or absorbed. the heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. in the laboratory a general chemistry student finds that when 1.44 g of cuso4(s) are dissolved in 106.40 g of water, the temperature of the solution increases from 24.05 to 25.58 °c. the heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.60 j/°c. based on the student's observation, calculate the enthalpy of dissolution of cuso4(s) in kj/mol. assume the specific heat of the solution is equal to the specific heat of water.

Explanation:

Heat absorbed by calorimeter = 1.6 x ( 25.58-24.05) = 2.448 J

Heat absorbed by solution = 107.84 x 1 x ( 25.58 - 24.05 ) = 164.99 J

mol of copper sulphate dissolved = 1.44/159.5 = 9.028 x 10⁻³.

[ Mol weight of copper sulphate is 159.5]

heat evolved by dissolution of 9.028 x 10⁻³ mol is 164.99 + 2.448 = 167.438 x 10⁻³ kJ

Heat evolved per mol = 167.438 x 10⁻³ / 9.028 x 10⁻³ = 18.55 kJ /mol

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.