Question

V Hint Check Answer Question 14 of 16 > At 1 atm, how much energy is required to heat 45.0 g H,O(s) at -10.0'C to H.O(g) at 143.0°C? Use the heat transfer constants found in this table. J730 ZOO I AO = 1 IU-

Answer 1

At constant pressure, the amount of heat required to increase the temperature of 1g substance to 1^oC is calculated by the formula-

Q = m * C × ΔT

Where Q = amount of heat required

m = mass of substance

C = specific heat

ΔT = change in temperature = final temperature – initial temperature

Now putting the given values

m = 45 g

C = specific heat for water = 4.186 J/ g^oC

final temperature = 143.0^oC

initial temperature = - 10.0^oC

So ΔT = 143.0^oC - (- 10.0^oC )

= 153.0^oC

Now putting the values-

Q = m * C × ΔT

Q = 45 g * 4.186 J/ g^oC × 153.0^oC

= 28820.61‬ J

Q = 28.821 kJ