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What volume of CH4(g), measured at 25°C and 745 torr, must be burned in excess oxygen to release 1.00 ×106 KJ of heat to the surrounding?
What is the enthalpy change when 12.8g H2(g) reacts with excess Cl2(g) to form HCl(g).
In a process in which 89J of work is done on a system, 567J of heat is given off. What is ∆E of the system?
1. A 32g sample of methane gas initially at 1atm and 27oC is heated to 277oC. The empirical equation for the molar heat capacity of methane at constant pressure is Cp = 3 + 2 10-2 T cal mole – deg K . Assume that methane behaves ideally, compute W, Q, U and H for
(i) an isobaric reversible process
(ii) an isochoric reversible process
(Useful constants: 1 atm = 101325Nm-2; R = 8.314JK-1mol-1; 1 Cal = 4.184J)
1. 1 mole of an ideal gas is allowed to expand against a piston that supports 0.4atm. The initial pressure was 10atm and final pressure is 0.4atms, the temperature being kept constant at 0oC.
(a) How much work is done by the gas during the expansion?
(b) What is the change in internal energy and in the enthalpy of the gas
(c) How much heat is absorbed?
2. One mole of gas is allowed to expand reversibly i.e. against confining pressure that is at all times infinitesimally less than the gas pressure, from an initial pressure of 10 atm to a final pressure of 0.4 atm, the temperature being kept constant at 00 C
a. Calculate how much work is done by the gas
b. Calculate the change in initial energy and enthalpy
c. Calculate how much heat is absorbed
(Useful constants: 1 atm = 101325Nm-2; R = 8.314JK-1mol-1; 1 Cal = 4.184J)
10g of the gas as 17oc are compressed adiabatically and reversibly from 8 to 5 liters.
i. Calculate the final temperature
ii. Calculate the work done on the gas.
iii. What are U and H for the process (Cp = 3/2R and R = 8.314).
Given that the free energy for NO2, O2, NO and O3 are 12.39, 0, 20.7 and 39.0 K cal mol-1 reversible as 25oC. Calculate the molar free energy and Kp for the reaction,
NO +O3→ NO2 + O2
(Useful constants: 1 atm = 101325Nm-2; R = 8.314JK-1mol-1; 1 Cal = 4.184J)
4. A 32g sample of methane gas initially at 1atm and 27oC is heated to 277oC. The empirical equation for the molar heat capacity of methane at constant pressure is
Cp = 3 + 2 10-2 T cal mole – deg K
Assume that methane behaves ideally, compute W, Q, U and H for
(i) an isobaric reversible process
(ii) an isochoric reversible process
chromium plating of a piece of metal required the deposition of 0.850g of chromium of a current of 3.0a is used find the time required to complete the plating of chromium solution used, taking chromium as 52 and faradays as 965000
chromium plating of a piece of metal required the deposition of 0.850g of chromium of a current of 3.0a is used find the time required to complete the plating of chromium solution used, taking chromium as 52 and faradays as 965000
