Question

QUESTION 10 Suppose you start with 269g of ice at 0 °C. Calculate the amount of heat energy that must be transferred to convert the ice to steam at 100 °C. (Use 334kJ/kg for the latent heat of fusion 2.26x103kJ/kg for the latent heat of vaporization, and 4.19kJ/kg°C for the specific heat of water.) Note: use the unit k).

Answer 1

Ang we will calculate total heat in three steps. First the heat needs to convertice into water. La latent heat of fusion = 334 KJ/kg M = 2699: 0.269 kg, so heat needs H, = ML = 0.2698334 89.85 KI.

se cond the heat needs to make crater from ore to 100'e specifie heat af alater = c.19 kJ/kg op & Difference of temperature O = 100%-oe = 100°C so heat needs H₂ = MK 100 0 = 0.269 x 4.19 X = 112.71 KK

Thind the heat needs to convert 100°C alatea in 100°c uapoua, Here, Latent heat of labourization L = 9.96X109kJ/kg so H₂ = ML = 0.269 x 9.26x103 = 607.94 KS .

So total heat - Hit Hat H₂ required = 189.85+ 112.714 607.94) KJ = 810.5 kJ .