In an experiment 4.5kg of a fuel was completely burnt. The heat produced was measured to be 1,80,000 KJ. Calculate the calorific value of the fuel.

In an experiment 10kg of a fuel produced 20000 kJ of heat. Calculate the calorifia value of the fuel.

Change in enthalpy and change in internal energy are state functions. The value of DeltaH, DeltaU can be determined by using Kirchoff's equation. I mole of naphthalene (C_(10)H_(8)) was burnt is oxygen gas at 25^(@)C at constant volume. The heat evolved was found to be 5138.8kJ. Calculate the heat of reaction at constant pressure

A sample of gaseous hydro carbon occupying 1 lit at NTP. When completely burnt in air produced 1.964g CO_(2) and 1.607 g H_(2)O . Calculate the volume of O_(2) (lit) at NTP required for its combustion.

When 10g of methane is completely burnt in oxygen the heat evolved is 560kJ. What is the heat of combustion (in kJ mol^(-1) of methane ?

Do all fuels produce same amount of heat when they are burnt?

A rectangular metal slab of mass 33.333 g has its length 8.0 cm, breadth 5.0 cm and thickness 1mm. The mass is measured with accuracy up to 1 mg with a senstitive balance. The length and breadth are measured with a vernier calipers having a least count of 0.01 cm. The thickness is measured with a screwgauge of least count 0.01 mm. Calculate the percentage accuracy in density from above measurements.

In an experiment to determine the value of acceleration due to gravity g using a simple pendulum , the measured value of lenth of the pendulum is 31.4 cm known to 1 mm accuracy and the time period for 100 oscillations of pendulum is 112.0 s known to 0.01 s accuracy . find the accuracy in determining the value of g.