± Exercise 6.50 with feedback An unknown mass of each of the following substance

Question

± Exercise 6.50 with feedback

An unknown mass of each of the following substances, initially at 23.0 C, absorbs 1960 J of heat. The final temperature is recorded as indicated. Find the mass of each substance.

Part A

a. Pyrex glass (Tf= 55.8 C)

Express your answer using two significant figures.

71.6

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Part B

sand (Tf= 62.3 C)

Express your answer using two significant figures.

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Part C

ethanol (Tf= 44.2 C)

Express your answer using two significant figures.

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Part D

water (Tf= 32.4 C)

Express your answer using two significant figures.

± Exercise 6.50 with feedback

You may want to reference ( pages 258 - 262) section 6.4 while completing this problem.

An unknown mass of each of the following substances, initially at 23.0 C, absorbs 1960 J of heat. The final temperature is recorded as indicated. Find the mass of each substance.

Part A

a. Pyrex glass (Tf= 55.8 C)

Express your answer using two significant figures.

m =

71.6

  g  

SubmitMy AnswersGive Up

Incorrect; Try Again; 5 attempts remaining

Part B

sand (Tf= 62.3 C)

Express your answer using two significant figures.

m =   g  

SubmitMy AnswersGive Up

Part C

ethanol (Tf= 44.2 C)

Express your answer using two significant figures.

m =   g  

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Part D

water (Tf= 32.4 C)

Express your answer using two significant figures.

Explanation / Answer

part A

q = m*s*DT

specificheat of glass = 0.75 j/g.k

dT = (55.8-23) = 32.8

1960 = m*0.75*32.8

m = mass of glass = 79.67 grams

part B

q = m*s*DT

specificheat of and = 0.83 j/g.k

1960 = m*0.83*(62.3-23)

m = mass of glass = 60.087 grams

part C

q = m*s*DT

specificheat of ethanol   = 2.46 j/g.k

1960 = m*2.46*(44.2-23)

m = mass of glass = 37.58 grams

part C

q = m*s*DT

specificheat of water   = 4.18 j/g.k

1960 = m*4.18*(32.4-23)

m = mass of glass = 49.88 grams

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