Perform each conversion between energy units. Part A 1.59×10 3 kJ to kcal Expres

Question

Perform each conversion between energy units.

Part A

1.59×103 kJ to kcal

Express the value in kilocalories to three significant figures.

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Part B

870 cal to kJ

Express the value in kilojoules to three significant figures.

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Part C

5.94×104 J to Cal

Express the value in Calories to three significant figures.

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Part D

3.52×104 kJ to kWh

Express the value in kilowatt-hours to three significant figures.

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Part E

The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 145 J of heat. As it expands, it does 73 kJ of work.

What is the change in internal energy for the system?

Express the energy in kilojoules to two significant figures.

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Suppose that 26 g of each substance is initially at 28.0 C.

Part F - 6.17a

What is the final temperature of gold upon absorbing 2.40 kJ of heat?

Express your answer using two significant figures.

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Part G - 6.17c

What is the final temperature of aluminum upon absorbing 2.40 kJ of heat?

Express your answer using two significant figures.

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An unknown mass of each of the following substances, initially at 24.0 C, absorbs 1950 J

of heat. The final temperature is recorded as indicated. Find the mass of each substance.

Part H - 6.18a

a. Pyrex glass (Tf= 55.5 C)

Express your answer using two significant figures.

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Part I - 6.18c

ethanol (Tf= 44.3 C)

Express your answer using two significant figures.

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Explanation / Answer

A)

1 kcal = 4.184 kJ ; then 1.59*10^3 kJ -->

(1.59*10^3 kJ)/(4.184 kJ/kcal) = 380.019 kcal

B)

870 cal to kJ

1 cal = 4.184 kJ

870 cal -_> x

x = 870*4.184 = 3640.08 kJ

c)

5.94×104 J to Cal

1 Cal = 4184 J

(5.94*10^4)/(4184) = 14.19 Cal

d)

5.94*10^4 kJ to kWhr

1 kWh = 3600 kJ

(5.94*10^4)/3600 = 16.5 kWh

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