Calorimetry Questions and Answers

1 3 Sipho prepares a bath by mixing 10 0 kg of water at 20 0 C and 10 0 kg of water at 70 0 C into a bath tub The final temperature of the mixture is 40 C Given that the heat capacity of the bath is 28 0 x 10 J C and assuming no heat exchange with the surroundings Calculate the temperature of the bath tub before Sipho poured the mixture in it 4

Please explair this mam sir I want an detailed explanation 14 2 gm of steam condenses when passed through 40 gm of water initially at 25 C The condensation of se raises the temperature of water to 54 3 C What is the latent heat of steam rioy pri 1 540 cal g 2 536 cal g 3 270 cal g 4 480 cal g

Q5 B A perfect reversed heat engine is used for making ice at 5 C from water available at 25 C The temperature of freezing mixture is 10 C Calculate the quantity of ice formed per kWh 5 For ice specific heat 2 1 kJ kg K and latent heat 335kJ kg

2 kg of ice at 20 C is mixed with 5 kg of water at 20 C in an insulating vessel having a negligible heat capacity Calculate the final mass of water remaining in the container It is given that the specific heats of water and ice are 1 kcal kg per C and 0 5 kcal kg C while the latent heat of fusion of ice is 80 kcal kg 1 7 kg 2 6 kg 3 4 kg 4 2 kg

A refrigeration system operating on reversed Brayton refrigeration cycle is used for maintaining 250K If the temperature at the end of constant pressure cooling is 300K and rise I the temperature of air in the refrigerator is 50R then the network of compression will be assume air as the working substance with Cp 1 KJ kg k a 250 KJ kg b 200 KJ kg c 50 KJ kg d 25 KJ kg

A body cools in a surrounding of a constant temperature 30 C Its heat capacity is 2 J C Initial temperature of the body is 400C Assume Newton s law of cooling is valid The body cools to 380C in 10 minutes when the body temperature has reached 38 C it is heated again so that it reaches to 40 C in 10 minutes Find the total heat required in J from heater by the body

10 gm of ice at 20 C is added to 10 gm of water at 50 C Specific heat of water 1 cal gm C specific heat of ice 0 5 cal gm C Latent heat of ice 80 cal gm Then resulting temperature is Question Type Single Correct Type 1 20 C 2 3 15 C 0 C

A cooking vessel on a slow burner contains 5 kg of water and an unknown mass of ice in equilibrium at 0 C at time t 0 The temperature of the mixture is measured at various times and the result is plotted as shown in diagram During the first 50 min the mixture remains at 0 C From 50 min to 60 min the temperature increases to 2 C Neglecting the heat capacity of the heat capacity of the vessel the initial mass of the ice is 7 C 3 2 1 0 20 40 50 60 min kg kg

A metal cube of side length 1 cm and temperature is kept on an ice slab at 0 C and of thickness 4 cm Find the minimum value of 0 for which the cube falls through the slab Assume that ice after melting forms water at 0 C and only the ice below the metal cube melts Smetal 0 08 cal g C Pice 0 9 g cc Pm 10 g cc DA 36 C B 100 C Oc 360 C OD 500 C

A copper calorimeter of negligible heat capacity contains 1kg water at 20 C The minimum amount of ice at 20 C that should be added to the water s that there is no water in the calorimeter in equilibrium is 5x kg Find x Take S ice 0 5 cal g K L ice 80 cal g

A glass mug contains 100 g coffee at 20 C If heat is added to it at the rate of 1 cal s how much time would it take for the coffee to heat up to 80 C Scoffee 0 25 cal g C A 1 min B 5 min c 25 min D 20 min

Figure provides data for a boiler and air preheater operating at steady state Methane CH4 enterir the boiler at 25 C 1 atm is burned completely with 170 of theoretical air Ignoring stray heat trans and kinetic and potential energy effects determine the temperature in C of the combustion air entering the boiler from the preheater Air 25 C 1 atm Combustion gas at 662 C Preheater T 797 C CH4 25 C 1 atm Boiler Feedwater M Steam

A calorimeter contains 0 2 kg of water at 30 C 0 1 kg of water at 60 C is added to it the mixture is well stirred and the resulting temperature is found to be 35 C The water equivalent of the calorimeter is 1 6300 J K 2 1260 J K 3 4200 J K none of these

m U 1 5 m lo Al 9 A sphere of a steel has diameter 5 70 cm at 27 C If diameter of ring at 27 C is 5 69 cm find the It is to be just inserted into a circular brass ring temperature at which the sphere just slide into the ring Given asteel 1 1 x 10 5 C 1 and abrass 1 9 10 5 C 1 pending

14 Two identical 1 0 kilogram blocks of copper metal one initially at a temperature T1 0 C and the other initially at a temperature T2 100 C are enclosed in a perfectly insulating container The two blocks are initially separated When the blocks are placed in contact they come to equilibrium at a final temperature Tf The amount of heat exchanged between the 2 blocks in this process is equal to which of the following The specific heat of copper metal is equal to 0 1 kilocalorie kilogram K O 50 kcal 25 kcal O 10 kcal 5 kcal 1 kcal

When 0 1 kg of ice at 0 C is mixed with 0 3kg of water at 35 C in a container The resulting temperature of the mixture is 8 C Calculate the heat of fusion of the ice Specific heat of water is 4200 J kg K