Solve with shown work. 1. A graduated cylinder is filled to 20.00 ml with water.

Question

Solve with shown work.

1. A graduated cylinder is filled to 20.00 ml with water.  A rubber stopper of mass 2.72 is placed in the cylinder and the water level rises to 25.05.  What is the density of the stopper?

2. A calorimeter's temperature was raised from 23.75 oC to 48.23 oC by the addition of 490.3 J of heat.  What is the heat capacity of the calorimeter (in J/K)?

3. A student adds 97.1 grams of metal at 95.0 oC to a calorimeter with a heat capacity 23.2 J/K, filled with 95.0 g of water at 23.0 oC.  If the final temperature of the system is 27.0 oC what is the the specific heat of the metal (J/gK)?

Explanation / Answer

1. Calculate the volume of the stopper:
V = 25.05-20 = 5.05 mL

Now density:
d = 2.72 g / 5.05 = 0.5386 g/mL

2. Q = Cp(Tf-Ti)
Cp = Q/Tf-Ti

Tf = 48.23+273.15 = 321.38 K
Ti = 23.75+273.15 = 296.9 K

Cp = 490.3 / (321.38-296.9)
Cp = 20.02 J/K

Question 3 post it in another question thread cause I have a doubt with that.

Hope this helps

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