A boiler heats water flowing at the rate of 2,0 litres per minute from 27°C to 77°C. If the boiler operates on a gas burner, the rate of consumption of the fuel if its heat of combustion is `4.0xx10^4J//g` , is

A tank initially contains 50 litres of pure water. Starting at time t = 0 a brine containing with 2 grams of dissolved salt per litre flows into the tank at the rate of 3 litres per minutes. The mixture is kept uniform by stirring and the well - stirred mixture simultaneously flows out of the tank at the same rate. Find the amount of salt present in the tank at any time t gt 0 .

At room temperature (27.0^(@)C) the resistance of a heating element is 100 Omega . What is the temperature of the element if the resistance is found to be 117 Omega . Given that the temperature coefficient of the material of the resistor is 1.70 xx 10-4 ^@C.

When 15.68 litres of a gas mixture of methane and propane are fully combusted at 0^@C and 1 atmosphere, 32 litres of oxygen at the same temperature and pressure are consumed. The amount of heat released from this combustion in kJ is ( DeltaH_C(CH_4) =-890 kJ mol^(-1) and DeltaH_C(C_3H_8)=-2220 kJ "mol"^(-1) )

An ideal gas heat engine is operating between 227°C and 127°C. It absorbs 10^4 J of heat at the higher temperature. The amount of heat converted into work is ______ J .

An experiment is performed to measure the molar heat capacity of a gas at constant pressure using Regnault's method. The gas is initially contained in a cubical reservoir of size 40 cm xx 40 cm xx 40 cm xx at 600 kPa at 27^0C . A part of the gas is brought out, heated to 100^0C and is passed through a calorimeter at constant pressure. The water equivalent of the calorimeter and its contents increases from 20^0C to 30^0C during the experiment and the pressure in the reservoir decresases to 525 kPa . Specific heat capacity of water = 4200 J kg^(-1) K^(1). Calculate the molar heat capacity Cp from these data.

A sample of 100 g water is slowly heated from 27^(o)C to 87^(o)C . Calculate the change in the entropy of the water. specific heat capacity of water =4200 j/kg k .