Chemistry Thermochemistry NUMS 2022
PMDC Verified Question 47 of 81
Specific heat of water is:
A
\( 8.47 \text{ J/g/}^\circ\text{C} \)
B
\( 4.18 \text{ J/g/}^\circ\text{C} \)
C
\( 6.04 \text{ J/g/}^\circ\text{C} \)
D
\( 9.82 \text{ J/g/}^\circ\text{C} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 4.18 \text{ J/g/}^\circ\text{C} \)
Concept:

Specific heat capacity (c) is the amount of heat energy required to raise the temperature of exactly one gram of a substance by one degree Celsius (or one Kelvin).

Formula:

$$ c_{\text{water}} = 4.18 \text{ J } g^{-1} ^\circ C^{-1} $$

Solution:

  • Water has an exceptionally high specific heat capacity due to the extensive network of strong intermolecular hydrogen bonds holding the molecules together.


  • Experimentally, it takes exactly 1 calorie of energy to raise 1g of water by 1°C.


  • Since 1 calorie = 4.18 Joules, the specific heat of water is \( 4.18 \text{ J/g/}^\circ\text{C} \).


Why other options are incorrect:

Options A, C, and D are random numerical values that do not correspond to the known physical properties of liquid water.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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