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Measurement Of Du And Dh Free Doubts and Solutions

CBSE - XI Science - Chemistry - Thermodynamics

  A system absorb 20 kJ heat and also does 10 kJ of work. The net internal energy of the system is :- (1) increases by 10 kJ (2) decreases by 10 kJ (3) increases by 30 kJ (4) decreases by 30 kJ

Asked by Atulcaald 25th May 2018, 12:31 AM
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CBSE - XI Science - Chemistry - Thermodynamics

a system absorbs 500J of heat and does work of 50J on its surroundings. calculate the change in internal energy

Asked by gganga 13th April 2018, 6:34 PM
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CBSE - XI Science - Chemistry - Thermodynamics

Calculate the enthalpy of decomposition of CaCO3 into CaO and CO2.The  of formation of CaCO3 is -288.5 k cal/mol, for CaO is -151.9 k cal/mol and for CO2.is -94.0 k cal/mol.

Asked by Topperlearning User 15th June 2016, 5:26 PM
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CBSE - XI Science - Chemistry - Thermodynamics

Define standard enthalpy of fusion.

Asked by Topperlearning User 15th June 2016, 5:22 PM
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CBSE - XI Science - Chemistry - Thermodynamics

On burning two moles of hydrogen with one mole of oxygen form two moles of liquid water and liberate 13,663 calories of heat. Write the thermochemical equation for this reaction.

Asked by Topperlearning User 15th June 2016, 5:22 PM
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CBSE - XI Science - Chemistry - Thermodynamics

Describe the construction and working of a bomb calorimeter.

Asked by Topperlearning User 15th June 2016, 5:21 PM
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CBSE - XI Science - Chemistry - Thermodynamics

Are liquid +liquid solutions exothermic or endothermic ?

Asked by Ibrahim Mohammed 18th March 2015, 8:34 PM
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CBSE - XI Science - Chemistry - Thermodynamics

The enthalpies of formation of C2H4 (g), CO2 (g), H2O (l) at 25oC atmospheric pressure are 52, -394 and -286 kJ mol-1 respectively. Calculate the enthalpy of combustion of C2H4.

Asked by Topperlearning User 13th August 2014, 4:02 PM
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CBSE - XI Science - Chemistry - Thermodynamics

Calculate the difference between heats of reaction at constant pressure and at constant volume for the reaction at 25oC in kJ.

Asked by Topperlearning User 13th August 2014, 2:37 PM
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CBSE - XI Science - Chemistry - Thermodynamics

Calculate the amount of heat required for making 1kg of calcium carbide according to the following reaction.


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The heats of formation of CaO, CaC2 and CO are -151.6, -14.2 and -26.4 kcal respectively.

Asked by Topperlearning User 13th August 2014, 2:32 PM
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CBSE - XI Science - Chemistry - Thermodynamics

How can we find out the atomicity of the gases from their molar heat capacities?

Asked by Topperlearning User 13th August 2014, 2:12 PM
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CBSE - XI Science - Chemistry - Thermodynamics

What is the use of a bomb calorimeter?

Asked by Topperlearning User 13th August 2014, 1:38 PM
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CBSE - XI Science - Chemistry - Thermodynamics

5 moles of an idealgas expands isothermally from a pressure of 10atm to 2atm at 300k.What is the largest mass which can be lifted through a height of 1m in this expansion ? plzz explain the answer in detail

Asked by TVISHA Bhatt 10th August 2014, 6:12 PM
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CBSE - XI Science - Chemistry - Thermodynamics

One mole of ethyl alcohol is completely burnt in oxygen to form water and carbon dioxide at 25oC to give 327 k cals. Calculate the heat of reaction at constant volume.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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