A microwave oven supplies 1.000 kJ per second.How many minutes should be set on the microwave in order to heat 250.g of water from 24.3°C to its boiling point?

Question

Quizplus · Accepted Answer

To find the time, first calculate the energy required to heat the water using the formula: Q = mcΔT, where m = 250 g = 0.25 kg, c = 4.18 kJ/kg°C, and ΔT = 100°C - 24.3°C = 75.7°C. Q = 0.25 kg * 4.18 kJ/kg°C * 75.7°C = 79.1 kJ. Since the microwave supplies 1 kJ/s, the time in seconds is 79.1 s. Convert to minutes: 79.1 s / 60 s/min = 1.32 minutes.

A Microwave Oven Supplies 1