Long Answer TypeHow will you verify Charle's law graphically? What is the practical importance of Charle's law?
Short Answer TypeLong Answer TypeWhat is absolute or kelvin scale of temperature?
With a temperature of absolute zero (i.e. –273°C) as the lowest temperature, a new scale for expressing the temperature has been developed which is called absolute scale or kelvin scale and the temperature expressed on this scale is called absolute or kelvin temperature.
In the kelvin scale, the size of the degree is kept the same as on the celsius scale but the zero is shifted to –273·15 below zero on the Celsius scale.
Thus, –273.15° C = 0 K
or 0° C = 273.15 K
or t° C = (273.15 + t) K
Hence temperature on absolute or kelvin scale may be obtained by adding 273.15 to the temperature on celsius scale.
TK = 273.15 + t°C
In practice, the above relation is generally taken as
TK = 273 + t° C where T is the temperature on kelvin scale and t is the temperature on celsius scale.
Short Answer TypeA sample of helium gas has a volume of 500 cm3 at 373K. Calculate the temperature at which the volume becomes 260 cm3. Assume that the pressure is kept constant.
On a ship sailing in Pacific ocean where the temperature is 23.4 °C, a balloon is filled with 2L air. What will be the volume of the balloon when the ship reaches Indian ocean, where the temperature is 26.1°C ?
A cylinder contains 450 mL of a gas at 27°C at constant pressure. The cylinder is placed in a refrigerator at –10°C. Calculate the resultant volume of the gas.
What volume of air will be expelled from a vessel containing 380 cm3 at 10°C when it is heated to 30°C at the same pressure ?
Long Answer TypeA student forgot to add the reaction mixture to the round bottomed flask at 27°C but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found that the temperature of the flask was 477°C. What fraction of air would have been expelled out?
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