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4 years ago

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How much heat is needed to change the temperature of 3 grams of gold (c = 0.129 ) from 21°C to 363°C? The answer is expressed to

the nearest whole number.
121 joules
132 joules
140 joules
149 joules

2 answers:

madam [21]4 years ago

8 0

The correct answer to the question is : B) 132 Joules.

EXPLANATION :

As per the question, the mass of the gold m = 3 gram.

The initial temperature of the gold T = 21 degree celsius.

The final temperature of the gold T' = 363 degree celsius.

Hence, the change in temperature dT = T' - T

= 363 - 21 degree celsius

= 342 degree celsius.

The specific heat of the gold is given as c = $0.129\ J/g^0C$

We are asked to calculate the heat required ( dQ ) to raise the temperature of gold.

The heat required for this is calculated as -

dQ = mcDT

= 3 × 342 × 0.129 J

= 132.354 J

≈ 132 J

Hence, the correct answer is 132 J.

motikmotik4 years ago

5 0

The answer is 132. Hope this helps. I got this answer right on an assignment. Have a wonderful day today.

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