Question

How much heat will be required to heat 10 grams of water from 20°C to 50°C?​

Answer 1

SOLUTION

TO DETERMINE

The amount of heat will be required to heat 10 grams of water from 20°C to 50°C

EVALUATION

Here by the given -

Amount of water = m = 10 grams

Initial temperature = T₁ = 20°C

Final temperature = T₂ = 50° C

Change in temperature

= ΔT

= T₂ - T₁

= 50°C - 20°C

= 30°C

Now the specific heat capacity of water

= 4.184 J/g/°C

Hence the total heat required

= 10 × 30 × 4.184 J

= 1255.2 J

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Answer 2

Given:

10 grams of water is heated from 20°C to 50°C.

To find:

Amount of heat required?

Calculation:

The net heat needed is :

$\rm \: H = m \times c \times \Delta T$

• 'm' is mass of water
• 'c' is specific heat capacity = 1 Cal/gram °C for water.
• ∆T is temperature change

$\rm \implies\: H = 10\times 1 \times (50 - 20)$

$\rm \implies\: H = 10 \times30$

$\rm \implies\: H = 300 \: Cal$

So, heat needed is 300 Calories.