Question

What is the amount of heat (in joules) required to raise the temperature of 125 grams of water from 25°C to its boiling point of 100°C? The specific heat capacity of water is 4.184 J/(g·°C) and the enthalpy of vaporization of water is 40.7 kJ/mol.

Answer 1

To calculate the amount of heat required to raise the temperature of 125 grams of water from 25C to 100C, we can use the formula:q = mcTwhere q is the heat in joules, m is the mass of the substance in grams, c is the specific heat capacity in J/ gC , and T is the change in temperature in C.Given:m = 125 gc = 4.184 J/ gC Initial temperature  T1  = 25CFinal temperature  T2  = 100CT = T2 - T1 = 100C - 25C = 75CNow, we can plug in the values into the formula:q =  125 g    4.184 J/ gC     75C q = 125  4.184  75q = 39225 JTherefore, the amount of heat required to raise the temperature of 125 grams of water from 25C to its boiling point of 100C is 39,225 joules.