A geyser heats water flowing at the rate of 3.0 litres per minute from 27^@ C`to `77 ^@C`. If the geyser operates on a gas burner. What is the rate of consumption of the fuel if its heat of combustion is 4.0×10 4 J/g?

A steam engine delivers 5.4 xx 10^8 J of work per minute and services 3.6 XX 10^8 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500^2C and then placed on a large ice block. What is the maximum amount of ice that can melt? (Specific heat of copper = 0.39 J g-^1K ^-1 , heat of fusion of water = 335 J g^-1)

A brass boiler has a base area of 0.15 m2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 109 J s ^-1m^- 1K^-1 , Heat of vaporisation of water = 2256 xx 10^3 J kg^-1 .

An electric heater takes 15 min to raise a certain quantity of water from 0°C to its boiling point.If it takes another 80 min to turn all water into steam ,find the latent heat of vaporsation of water.

A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0 ^@C . What is the change in the diameter of the hole when the sheet is heated to 227 ^@C ? Coefficient of linear expansion of copper = 1.70 xx 10^-5 K^-1 .

A ‘thermacole’ icebox is a cheap and efficient method for storing small quantities of cooked food in summer in particular. A cubical icebox of side 30 cm has a thickness of 5.0 cm. if 4.0 kg of ice is put in the box, estimate the amount of-ice remaining after 6 h. The outside temperature is 45 ^@C , and co-efficient of thermal conductivity of thermacole is 0.01 J s^-1.m-^1 K-^1 . [Heat of fusion of water = 335 x 103 J kg^-1

In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150^@C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 1-50 cm^3 of water at 27^@C . The final temperature is 40^@C . Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal?

In a reaction, 2A rarr Products , the concentration of A decreases from 0.5 mol L^-1 to 0.4 mol L^-1 in 10 minutes. Calculate the rate during this interval?

The gas phase decomposition of acetaldehyde, CH_3CHO(g) rarr CH_4(g)+CO(g) at 680K is observed to followed the rate expression: Rate -d[CH_3CHO]/dt=k[CH_3CHO] ^(3/2) IF the rate of decomposition is followed by monitoring the pantial pressure of actetaldehyde, we can express the rate as. dP_(CH_3CHO//dt)=k[P_(CH_3CHO]^ (3/2) If the pressure is measured in atomospheres and the time in minutes than What are the units of the rate of reaction?