How much heat (in joules) is needed to raise the temperature of 500 g of water by 20 degrees C? (specific heat 4.2 J/(g C))
Answer and explanation
Correct answer: B. 42000
- Step 1: Q = m c delta T.
- Step 2: Q = 500 x 4.2 x 20 = 42000 J.
Answer
42000.
Why not the others: The specific heat of water must be included, and the temperature change must be multiplied in.
Practise more Gases and thermal physics.
Free questions with an explanation for every one, and full timed Državna Matura (Montenegro) mock tests.
More Gases and thermal physics questions
- What pressure (in kPa) does 2 mol of an ideal gas exert in a 20 L container at 250 K? (R = 8.314 J/(mol K))
- What pressure (in kPa) does 1 mol of an ideal gas exert in a 10 L container at 250 K? (R = 8.314 J/(mol K))
- How much heat (in joules) is needed to raise the temperature of 200 g of water by 40 degrees C? (specific heat 4.2 J/(g C))