specific heat of air at constant pressure and constant volume are 0.237cal /g/C and 0.169cal /g/C and J ÷= 4 .2J/cal .Calculate density of air Related: Specific Heat Capacity and Calorimetry?

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specific heat of air at constant pressure and constant volume are 0.237cal /g/C and 0.169cal /g/C and J ÷= 4 .2J/cal .Calculate density of air

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An ideal gas is initially at a pressure of 0.1 MPa and a total volume of 2m3. It is first compressedto 1MPa by a reversible adiabatic process and then cooled at constant pressure to a final volumeof 0.2m3. The total work done (in kJ) on the gas for the entire process (up to one decimal plac e) is____________Data: R = 8.314 J/molK; heat capacity at constant pressure (CP) = 2.5RImp : you should answer only the numeric value Correct answer is '750'. Can you explain this answer?

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Importance of high specific heat capacity of water for life Specific heat capacity of a substance is the amount of heat required to raise the temperature of that substance by 1 K. It is expressed in the units J/ (kg K). A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. Water has the highest known specific heat capacity. Its specific heat capacity is 4.186 K J/ (kg K) i.e. to raise the temperature of 1 kg of water by 1 Kelvin it requires 4.186 KJ of heat. For comparison sake, Copper requires only 385 Joules of heat to raise 1 kilogram of copper by 1 Kelvin. It also interesting to know that the specific heat capacities in two other phases of water (i.e. ice and water vapour) are less than this. High specific heat of water is mainly due to the presence of a large number of hydrogen bonds between molecules of water. On a beach on a sunny day, it is noticed that the sand is often quite hot to walk on, but the water is always cool, even in the shallows. This is because sand has a lower specific heat capacity than that of water. Sand takes less energy to raise the temperature by one degree. Because water has a high specific heat capacity, it requires more energy to raise the temperature by one degree. Since the sun puts same rate of energy on water and sand, which heats up sand more quickly and water more slowly. Water covers around 70% of the Earth's surface and its high specific heat plays a very important role to sustain life in the earth. It is able to absorb a lot of heat without a significant rise in the temperature. When temperatures decrease, the heat which is stored is released, restraining a rapid drop in temperature. The combined effect is the buffering of heat. A relatively constant temperature without sudden rise and drop is essential to sustain life. Hence water is important for life.Q. Which statement is false?

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