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Subject: Chemistry, asked on 30/10/15

AB,A2 and B2 are diatomic molecules.If the bond energy of A2,AB and B2 are in the ratio 1:1:0.5 and enthalpy of formation of AB from A2 and B2 is -100 kJ/mol.What is the bond enthalpy of A2?

Subject: Chemistry, asked on 18/2/14

A spherical balloon of 21 cm diameter is to be filled up with hydrogen at NTP from a cylinder containing the gas at 20 atm. at 27 degree celcius. If the cylinder can hold 2.82 litres of water, calculate the numbers of balloons that can be filled up ?

Subject: Chemistry, asked on 2/12/10

what is atomicity of gas?explain briefly

Subject: Chemistry, asked on 23/2/15

Find the difference between heats of reaction at constant pressure and constant volume for the following reaction at 25 C in kJ.

2C6H6 + 15O2 ---------> 12CO2 + 6H2O.

Subject: Chemistry, asked on 4/1/13

What do you mean by Cp and Cv. Derive the relation between Cp and Cv.

Subject: Chemistry, asked on 8/9/16

the standard we entropies of N2 , H2 and NH3 are 191.5 , 130.5 , 192.6JK mol.the value lf S of formation of ammonia is

Subject: Chemistry, asked on 31/12/16

2 mole of ideal gas at 27 degree celsius temperature is expanded reversibly from 2 litre to 20 litre. find entropy change (r=2 cal/mol k).

Subject: Chemistry, asked on 7/9/15

The heat of neutralisation of LiOH and HCl at 298k is 34.868kJ/mol. The heat of ionisation of LiOH will be?

Subject: Chemistry, asked on 25/9/15

the enthalpy of formation of H2O(l) is -280.70 kj/mol and enthalpy of neutralisation of strong acid and strong base is -56.70 kj/mol. What is the enthalpy of formation of OH- ions

Subject: Chemistry, asked on 25/12/13

Derive Cp- Cv = R.

Subject: Chemistry, asked on 29/11/11

calculate the enthalpy of the reaction of  C2H4(g)+H2(g) give rise to C2H6(g)from the the following data??

  1. C2H4(g)+3O2(g) give rise to 2C02+2H20(l)   delH=-1411KJ
  2. 2C2H6(g)+7O2(g) give rise to  4CO2(G)+6H2O(l)  delH=-1560KJ
  3. 2H2(g)+O2(g) give rise to 2H2O(l)  delH=-285.8KJ

pls fast urgent I want it within 2hrs????pls plsssssssss help

Subject: Chemistry, asked on 8/11/13

Calorific valueof ethane, in kJ/g if for the rxn

2C2H6 + 7O2--- 4CO2 + 6H2O + 745.6 kcal

Ans -52

How?

Subject: Chemistry, asked on 6/1/17

 A CYLINDER CONTAINS EITHER ETHYLENE OR PROPYLENE 12 ML OF GAS REQUIRED 54 ML OF OXYGEN FOR COMPLETE COMBUSTION. THE GAS IS 
A) ETHYLENE 
B) PROPYLENE 
C) 1:1 MIXTURE OF TWO GASES

Subject: Chemistry, asked on 5/2/13

If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1bar and 100°C is 41kJ mol-1. Calculate the internal energy change, when

(i) 1 mol of water is vaporised at 1 bar pressure and 100°C.

(ii) 1 mol of water is converted into ice.

Subject: Chemistry, asked on 27/2/13

how to convert Ethyne to acetaldehyde ?

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