previous 4 of 10 Part A It takes 54.0 J to raise the temperature of an 9.40 g pi

Question

previous 4 of 10 Part A It takes 54.0 J to raise the temperature of an 9.40 g piece of unknown metal from 13.0°C to 24.0 oC What is the specific heat for the metal? Express your answer with the appropriate units. Hints Cs Value Units Submit My Answers Give Up Parts B and C The next two questions pertain to silver They have nothing to do with unknown metal described in Part A. Part B The molar heat capacity of silver is 25.35 J e C How much energy would it take to raise the temperature of 9.40 g of silver by 12.0 C? Express your answer with the appropriate units. Hints Value Units Submit My Answers Give Up Part C What is the specific heat of silver? Express r answer with the a propriate

Explanation / Answer

Ans

Part A

Q = m.c.t

where m is the mass

c is the specific heat capacity

t is the temperature change

putting the values in the formula

54.0 = 9.40 x c x (24- 13)

c = 0.52 J/goC

Part B

Q = n.C t

where n is number of moles

C is molar heat capacity

n = 9.40 / 107.9 = 0.087 moles

So keeping all the values

Q = 0.087 x 25.35 x 12

Q = 26.5 Joules

Part C

Specific heat = molar heat capacity / molar mass

= 25.35 / 107.9

=0.235 J/goC

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