Question

1. How much steam is formed when 370 kcal heat is supplied to
2 kg water at 50 °C ? The latent heat of vaporization of water is
540 kcal/kg and the specific heat of water is 1 kcal/kg °C.​

Answer 1

Explanation:

For first step,

Q1= m*c*ΔΦ

Q1= 2500*1*75 cal

Q1=1,87,500 cal

For second step,

Q2= m*L

Q2= 2500*540 cal

Q2=13,50,000 cal

Thus total heat,

Q= Q1 + Q2

Q= 1,87,500 + 13,50,000

Q= 15,37,500 cal

Q= 1537.5 kcal

Q= 1537.5*4.184 kJ

Q= 6432.9 kJ