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Heat reaction

4. Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 40. cm3. If the combustion of this mixture releases 845 J of energy, to what volume will the gases expand against a constant pressure of 650. torr if all the energy of combustion is converted into work to push back the piston?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

16300

OTA ID:

103139

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Heat capacity

A 5.00 g sample of aluminum pellets (specific heat capacity = 0.89 J/°C · g) and a 10.00 g sample of iron pellets (specific heat capacity = 0.45 J/°C · g) are heated to 100.0°C. The mixture of hot iron and aluminum is then dropped into 97.7 g of water at 24.2°C. Calculate the final temperature of the metal and water mixture, assuming no heat loss to the surroundings.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

16303

OTA ID:

103997

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Enthalpy

see attachment Consider the following reaction. CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H = -891 kJ Calculate the enthalpy change for each of the following cases. (a) 3.00 g methane is burned in excess oxygen. (b) 3.00 103 L methane gas at 738 torr and 21°C is burned in excess

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

16304

OTA ID:

102509

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enthalpy

In a coffee-cup calorimeter, 1.10 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.93°C. Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

16305

OTA ID:

103642

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enthalpy

see attachment

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

16306

OTA ID:

103139

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