Chemistry, 28.04.2021 05:00 SuperWoman9172

If 150. Grams of water must be heated from 22.0°C to 100.0 °C to make a cup of tea, how much heat must be added? What is the mass of an iron piece that cools from 50.2 °C to 27.8°C while releasing 351.7 J of heat? The specific heat capacity of iron is 0.444 J/g°C.

A 52.7 g. piece of an unknown metal is heated up 51.4 °C when given 3492 J of heat. What is the specific heat capacity of the metal?

A 25.0g piece of aluminum sits in a room and cools. It loses 4300.0 J of heat. If the initial temperature of aluminum is 125.3°C, what is the final temperature? The specific heat capacity of aluminum is 0.900 J/g°C.

How much energy is removed when 45 grams of ethanol condenses to liquid? Ethanol heat of vaporization is ΔH(vap) 38.6 kJ/mol and heat of fusion is ΔH(fus) 4.60 kj/mol. Ethanol is 46. g/mol.

How much energy is required to melt 135 grams of frozen ethanol? Ethanol heat of vaporization is ΔH(vap) 38.6 kJ/mol and heat of fusion is ΔH(fus) 4.60 kj/mol. Ethanol is 46. g/mol.

120. grams of ethanol are cooled from 90.0°C to 73.4° C. What is the heat change (in Joules)? Ethanol heat of vaporization is ΔH(vap) 38.6 kJ/mol and heat of fusion is ΔH(fus) 4.60 kj/mol. Specific heats for the three phases of ethanol are: cp (liquid) ethanol 2.46 J/g°C, cp (gas) ethanol 1.43 J/g°C, cp (solid) ethanol 2.42 J/g°C. Ethanol is 46 g/mol. The melting point of ethanol is -114.1 °C and the boiling point is 78.4 °C.

If water is cooled from 90°C to 40°C will the energy lost be a positive number or a negative number? Why?

50.0 grams of ethanol are heated from -120.°C to 25.0°C how many joules were required? Ethanol heat of vaporization is ΔH(vap) 38.6 kJ/mol and heat of fusion is ΔH(fus) 4.60 kj/mol. Specific heats for the three phases of ethanol are: cp (liquid) ethanol 2.46 J/g°C, cp (gas) ethanol 1.43 J/g°C, cp (solid) ethanol 2.42 J/g°C. Ethanol is 46. g/mol. The melting point of ethanol is -114.1 °C and the boiling point is 78.4 °C.

79.2 grams of H2O is cooled from 115 °C to -43.1°C. What is the heat change in joules?
The molar heat of vaporization of H2O is 40.8 kJ/mol. The molar heat of fusion of H2O is 6.02 kJ/mol. Cp (solid) for H2O is 2.11 J/g°C. Cp (liquid) for H2O is 4.18 J/g°C. Cp (gas) for H2O is 2.00 J/g°C. The melting point of H2O is 0.0 °C and the boiling point is 100.0 °C.

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If 150. Grams of water must be heated from 22.0°C to 100.0 °C to make a cup of tea, how much heat mu...

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