Chemistry questions
29404 published questions with worked solutions.
- A hypothetical reaction, A 2B , proceeds through following steps : A C , H=q_1 C D , H=q_2 12D B , H=q_3 The heat of reaction is
- The bond energy of O-H bond is “Y” J ,mol^ -1 . When one mole of water is formed, which of the following takes place?
- Which one of the following expresses Q as the heat of combustion?
- For which one of the following statements, the standards enthalpy is zero?
- The heat of neutralization of four acids p, q, r and s when neutralized against a common base are 13.7, 9.4, 11.2 and 12.4 kcal...
- A person requires 2870 kcal of energy for leading a normal life. If heat of combustion of cane sugar is -1349 kcal then a person...
- Daily requirement of energy of a person is 'x' kJ. If heat of combustion of a food material (molecular weight =100) is '-y' kJ,...
- In the combustion of 4 grams of CH_4 , 2.5 kcal of heat is liberated. The heat of combustion CH_4 is
- Enthalpy of combustion of carbon is -395 kJ . The amount of carbon needed to evolve 39.5 kJ is
- The heat change taking place in the reaction H_2O( l ) H_2O(g) , H( H_2O )_g=57 k Cal ; H( H_2O )_l=+68.3 K Cal
- For the reaction H_2(g)+Br_2(g) 2HBr(g) ; H=-72.6 kJ . The heat of formation of the HBr is
- The molar heat of vaporization for water is 9.72 kcal ,mol^ -1 . The amount of heat change when 45 g of water condense is :
- The heat of formation of HCl from the following reaction is H_2(g)+Cl_2(g) 2HCl(g) ; H=-44 kcal
- The heat of combustion of butane is 2890 kJ ,mole^ -1 . Its calorific value is
- Combustion of glucose takes place as C_6H_ 12 O_6(s)+6O_2(g) 6CO_2(g)+6H_2O(g) ; H=-72 kcals. The energy needed for the...
- The bond energy of oxygen is 120 kcal. This means that :
- 2HCl H_2+Cl_2 ; H=-44 kcals. In this reaction heat of formation of HCl in kcals is
- A cylinder of gas contains 11.2 kg of butane ( C_4H_ 10 ). A family needs 20 , 000 kJ of energy per day for cooking. If the heat...
- Which of the following has the highest heat of combustions?
- The heat evolved in the combustion of benzene is given by : C_6H_6+7 12O_2 6CO_2(g)+3H_2O( l ) H=-3264.6 kJ Which of the...