Question

A slice of pizza has 500 kcal. If we could burn the pizza anduse all the heat to warm a 50-L container of cold water, what wouldbe the approximate increase in the temperature of the water?(Note: A liter of cold water weighs about 1 kg.)
a. 50°C
b. 5°C
c. 10°C
d. 100°C
e. 1°C

Answer 1

Answer:

c. 10°C

Explanation:

Given that: A slice of pizza has 500 kcal.

That is to say Q = 500kcal

If the pizza was burned and all the heat were used to warm a 50-L container of cold water,

what  would be the approximate increase in the temperature of the water?

We were also being told to note that; A liter of cold water weighs about 1 kg.

i.e 50-L container weighs about 50kg (mass)

∴ Since;

Q= 500kcal,

m = 50kg; &

the specific heact (c) = 1

we can find the approximate increase in the temperature of the water by using the formula:

Q = mcΔT

ΔT = $\frac{Q}{mc}$

ΔT = $\frac{500}{50*1}$

ΔT = 10°C