When boiling water a hot plate takes an average of 8 min and 55 seconds to boil 100ml of water assume the temperature in the lab is 75 degrees Fahrenheit The hot plate is rated to provide 283 watts?

Answer 1

To determine the efficiency of the hot plate, we can consider the energy required to heat 100ml of water from the laboratory temperature (75°F or about 24°C) to boiling (100°C). The specific heat capacity of water is approximately 4.18 J/g°C. For 100ml (or 100g) of water, the energy required is around 3,130 Joules. Given the hot plate's power rating of 283 watts, it would take about 11 seconds to deliver this amount of energy, indicating that the hot plate is not operating at optimal efficiency, as it takes significantly longer (8 minutes and 55 seconds) to boil the water.