Chemistry questions
29404 published questions with worked solutions.
- Certain gas expands from 10 dm^3 to 35 dm^3 isothermally by absorbing 413 kJ of heat. What is the work done?
- The moles of an ideal gas expand spontaneously into a vacuum. The work done is
- The work done (in erg) for the reversible expansion of one mole of an ideal gas from a volume at 10 L to 20 L at 298 K is
- The laws of thermodynamics are derived from
- The gas is expanded by absorbing 1171.5 J of heat. If work done in the expansion is 732.2 J, calculate internal energy change
- A system evolves 152.5 cal energy. But works equivalent to 54.3 cal energy. Its change in internal energy will be equal to
- Reaction exist in solid and liquid states
- The molar heat of reaction of NH_4NO_3(s) N_2O(g)+2H_2O( l ) is -122.55 kJ at 25^ C and 1.0 atmospheric pressure. U for the...
- For the reaction : N_2(g)+3H_2(g) 2NH_3(g) ; H=_____
- Which of the following is correct relationship between H (enthalpy), U (internal energy), P (pressure) and V (volume) of a system?
- Enthalpy may be given as :
- The difference between heats of reaction at constant pressure and constant volume for the reaction : 2C_6H_6( l )+15O_2(g)...
- In which of the following reaction will U be equal to H?
- If H is the heat of reaction at constant pressure, U is the heat of reaction at constant volume and n is the difference in number...
- In which of the following reaction will U be equal to H?
- For the reaction : N_2+3H_2 2NH_3 : H is equal to
- Given the reaction at 1240 K and 1 atm CaCO_3(s)=CaO(s)+CO_2(g) ; H=176 kJ/mol ; than U equals
- For complete combustion of gaseous isobutene
- For the gaseous reaction : 2A(g)+3B(g) 3C(g)+4D(g) at 27^ C , H=17 kcal . Assuming that R=2 cal ,K^ -1 ,mol^ -1 , U for the...
- The heats of combustion of carbon monoxide at constant pressure and at constant volume at 27^ C will differ from one another by...