Q1. When 3.0 kg of water is warmed from 10∘C to 80∘C, how...

Question

Q1. When 3.0 kg of water is warmed from 10∘C to 80∘C, how...

Q1. When 3.0 kg of water is warmed from 10∘C to 80∘C, how much heat (q) is needed? Round to two significant figures.

Hint: Cs of water = 4.184 J/g⋅∘C

1. 880 kJ
2. 0.88 kJ
3. 8.8 x 105 kJ

Q2. A calorimeter contains 100 g of water at 39.8∘C. An 8.23 g metal object (whose temperature is 50.0∘C) is placed inside the calorimeter. When equilibrium has been reached, the new temperature of the water and the metal is 40.0C∘. What type of metal is the object made from?

Hints: (1) Cs of water = 4.184 J/g⋅∘C, (2) solve for the specific heat capacity of the unknown metal, and (3) use the table of Specific Heat Capacity of Common Substances Actions to identify the metal.

1. Mn (s)
2. Mg (s)
3. Al (s)
4. Pb (s)

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