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Molecular Physics | Thermodynamics
Calculate the energy required in joules to raise the temperature of 450 grams of water from 15°C to 85°C. (The specific heat capacity of water is 4.18 J/g/°C)
Molecular Physics | Thermodynamics
If evaporation is a cooling process qnd boiling is a rapid evaporation, is it accurate to say that boiling is a rapid cooñing process? Explain.
Molecular Physics | Thermodynamics
Calculate the amount of heat needed to raise the temperature of 2 liter water form 20°C to the building point. The specific heat capacity of water is 4180J/Kg.C°
Molecular Physics | Thermodynamics
A large container which has 285 g of water initially at 21 °C is placed in a microwave oven. The
magnetron in the microwave oven can produce 950 W of EM radiation. The microwave is turned
on for 2.5 minutes. Assuming that all the microwave energy is absorbed by the water, how much
water is left in the container?
magnetron in the microwave oven can produce 950 W of EM radiation. The microwave is turned
on for 2.5 minutes. Assuming that all the microwave energy is absorbed by the water, how much
water is left in the container?
Molecular Physics | Thermodynamics
Use the van der Waals equation and the ideal gas equation, calculate the volume of 1.000 mol of neon gas at a pressure of 500.0 atm and a temperature of 355.0 K. Explain why the two values are different. (For Ne: a = 0.211 L2 atm/mol2 and b = 0.0171 L/mol)
Molecular Physics | Thermodynamics
A daredevil is shot out of a cannon at 45.0° to the horizontal with an initial speed of 29.5 m/s. A net is positioned a horizontal distance of 50.5 m from the cannon. At what height above the cannon should the net be placed in order to catch the daredevil?
Molecular Physics | Thermodynamics
Dr Blalock heat up his coffee inside the laboratory using a Bunsen burner. He off the flame when the coffee reach it boiling point. He leaves the room and after 30 minutes, the temperature drop to room temperature. Does he need to perform the same process again? Explain the phenomena and justify your answer
Molecular Physics | Thermodynamics
a) Determine the enthalpy changes, ΔH for the reaction below, given the following reactions and subsequent ΔH values. Please rewrite the amended chemical reaction equation again.
N2H4 (l) + CH4O (l) CH2O (g) + N2 (g) + 3H2 (g)
2NH3 (g) N2H4 (l) + H2 (g) ΔH = 22.5kJ
2NH3 (g) N2 (g) + 3H2 (g) ΔH = 57.5 kJ
CH2O (g) + H2 (g) CH4O (l) ΔH = 81.2 kJ
b) Given that the enthalpy of vaporization for water as below:
H2O (l) H2O (g) ΔH vap = 44.0 kJ mol-1
Calculate enthalpy ΔH for each of the following processes:
i) Evaporating 3.00 moles of water
ii) Evaporating 3.00 grams of water
i) Condensing 20.0 grams of water
(3 Marks)
c) Use the enthalpy of formation data to calculate the enthalpy of the reaction below.
2C2H6 (g) + 7O2 6H2O (g) + 4CO2 (g)
N2H4 (l) + CH4O (l) CH2O (g) + N2 (g) + 3H2 (g)
2NH3 (g) N2H4 (l) + H2 (g) ΔH = 22.5kJ
2NH3 (g) N2 (g) + 3H2 (g) ΔH = 57.5 kJ
CH2O (g) + H2 (g) CH4O (l) ΔH = 81.2 kJ
b) Given that the enthalpy of vaporization for water as below:
H2O (l) H2O (g) ΔH vap = 44.0 kJ mol-1
Calculate enthalpy ΔH for each of the following processes:
i) Evaporating 3.00 moles of water
ii) Evaporating 3.00 grams of water
i) Condensing 20.0 grams of water
(3 Marks)
c) Use the enthalpy of formation data to calculate the enthalpy of the reaction below.
2C2H6 (g) + 7O2 6H2O (g) + 4CO2 (g)
Molecular Physics | Thermodynamics
You are using water to dilute small amounts of chemicals in the laboratory, drop by drop. How many drops of water are there in a 1.0L bottle ?
Molecular Physics | Thermodynamics
The volume of a gas is doubled at constant pressure initially at 87c,calculate the new temperature
