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Molecular weight and mole concept

7.15 The supply of uranium in the United States (and the rest of the world) is large, but not limitless. By failing to reprocess spend nuclear fuel, we are discarding a potential source of energy that some European countries are presently tapping. Is the current American practice justified? Why is it different from the European practice? List arguments on both sides of this issue and then take a stand. 7.18 Isaac Asimov pointed out in one of his many books that a human contains approximately 3.0 X 10 to the 26th power carbon atoms, of which 3.5 X 10 to the 14th power are radioactive carbon –14 atoms. With each breath you inhale about three and a half million (3.5 X 10 to the 6th power... click for more

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

13522

OTA ID:

103997

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Specific Heat

When 110.0g of gasoline undergoes comustion, 9580 kJ of energy are released. Express the heat in kilocalories. (Note: 4.184J=1cal)

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

13538

OTA ID:

103940

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Specific Heat

How much heat is released when 250.0g of copper is cooled from 100.0ÂșC to 20.5Âș? The specific heat of copper is 0.0921 cal/gÂșC.

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

13539

OTA ID:

102509

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Specific Heat

A 73.6g sample of aluminum is heated to 95.0ÂșC and dropped into 100.0 g of water at 20.0ÂșC. If the resulting temperature of the water is 30.0ÂșC, what is the specific heat of the metal?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

13542

OTA ID:

102509

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Conservation of Energy

A sample of water weighing 125g releases 10.0 kcal of heat as it cools from 80.5Âș to 0ÂșC. It then releases another 10.0 kcal of heat as it freezes at this temperature. How many kcal of heat are needed in order to convert 125g of ice at 0Âș to water at 80.5ÂșC?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

13543

OTA ID:

103940

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