A 25.0 g sample of zinc is heated, and then placed in a calorimeter containing 6

Question

A 25.0 g sample of zinc is heated, and then placed in a calorimeter containing 65.0 g of water. Temperature of water increases from 200.0 degree C to 220.50 degree C. The specific heat of zinc is 0.390 J/g degree C. What was the initial temperature of the zinc metal sample? (final temperatures of zinc and water are the same) A 13.5 g sample of gold is heated, and then placed i a calorimeter containing 160.0 g of water Temperature of water increases from 19.00> C to 20 00 degree C The specific heat of gold is 0.130 J/fe What was the initial temperature of the gold metal sample?

Explanation / Answer

8 )

heat loss by Zn = heat gain by the water

Q = m Cp dT

25 x 0.390 x ( T1-220.50) = 65 x 4.184 x (220.50 -200)

T1 = 437.4 oC

initial temperature of Zn = 437.4 oC

9)

13.5 x 0.130 x (T1 -20) = 160 x 4.184 x (20-19)

T1 = 410 oc

initial temperature of the gold = 410 oC

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