How calories affect water?

Question

How many calories are needed to bring 150 grams of water @ 75°C to vapor at 110°C.

Best answer gets 10pts.

Use: http://www.emsc.nysed.gov/osa/reftable/esp1-7.pdf

Answer 1

Heating the water needs 1 calorie/gram/°C of sensible heat

From 75 to 100°C = 25° increase.

Heat required = 25 x 150 x 1 = 3,750 cal

To vaporise to steam needs 539 calories/gram of latent heat.

150g x 539 = 80,850 cal

To heat the steam needs 0.25 calories/gram/°C .. sensible heat.

(110 - 100) x 0.25 x 150 = 375 cal.

Total heat input = 3,750 + 80,850 + 375 = 84,975 calories.

=84.975 kcal

Answer 2

1 gram of water brought up by 1 degree celsius uses I calorie.

To bring up 110 - 75 = 35 degree

1 gram of water brought up by 35 degree uses 35 calories.
Therefore
150 gram of water brought up by 35 degree uses 150*35=5250 calories.

Answer 3

A calorie is the energy needed to raise the temperature of 1g of water by 1°C.

You want to heat 150g of water by 35°C.

150*35=5250

So you need 5250 (5.25k) calories.