How much heat is released as 5.00G of PB cool from 75.0° C to 25.0° C

32.25 J

Explanation:

Heat, H = ?

Mass, m = 5g = 5 / 1000 = 0.005 Kg

Initial Temperature = 75.0° C

Final Temperature = 25.0° C

Temperature change, ΔT = Final - Initial = 50° C

Specific heat capacity of lead, C = 129 (J/kg°C)

The relationship between these quantities is given by the equation

H = mCΔT

H = 0.005 * 129 * 50

H = 32.25 J

Answer :  The molality of solution is, 0.170 mole/kg

Explanation : Given,

Mass of dichlorobenzene = 0.25 g

Mass of cyclohexane = 10.0 g

Molar mass of dichlorobenzene = 147.01 g/mole

Formula used :

Therefore, the molality of solution is, 0.170 mole/kg