Waec Model Questions Vol1 2021 Physics Question 30

Practice objective / multiple choice question 30 from the 2021 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2021 Physics Objective / Multiple Choice Medium Difficulty
Question 30 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A 150 g copper block at 120 °C is placed into an insulated calorimeter containing 250 g of water at 25 °C and 100 g of ice at 0 °C. The specific heats are c_{Cu}=0.385 J·g⁻¹·K⁻¹, c_{water}=4.18 J·g⁻¹·K⁻¹ and the latent heat of fusion of ice is L_f=334 J·g⁻¹. Assuming no heat loss to the surroundings, determine (i) the final equilibrium temperature of the system and (ii) the mass of ice that melts.

Answer Options

A. Final temperature 0 °C; ice melted ≈ 120 g
B. Final temperature -3 °C; ice melted ≈ 0 g
Correct Answer C. Final temperature 0 °C; ice melted ≈ 99 g
D. Final temperature 5 °C; ice melted ≈ 70 g
Correct Answer
C
Correct Option:
Final temperature 0 °C; ice melted ≈ 99 g

About This Question

This is Waec Model Questions Vol1 2021 Physics Question 30. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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