Question

Which of the following would require the greatest number of calories? 1. Heating 1000 g of water from 10◦C to 12◦C 2. Heating 10 g of water from 10◦C to 40◦C 3. Heating 100 g of water from 10◦C to 50◦C 4. Heating 1 g of water from 10◦C to 80◦C

Answer 1

Answer:

with the formula of m×cv×∆T

1) option is correct

Answer 2

Given:

(1) m₁ = 1000 g, ΔT₁ = 2

(2) m₂ = 10 g, ΔT₂ = 30

(3) m₃ = 100 g, ΔT₃ = 40

(4) m₄ = 1 g, ΔT₄ = 70

To Find:

Greatest amount of calories required.

Calculation:

- The formula of heat required is:

Q = mcΔT

- Since c is same, so the product of mΔT will decide the amount of calories required.

m₁ ΔT₁ = 2000

m₂ ΔT₂ = 300

m₃ ΔT₃ = 4000

m₄ ΔT₄ = 70

- So, the greatest no of calories will be required for (3) Heating 100 g of water from 10◦C to 50◦C