Question

In the laboratory a
, or constant
pressure calorimeter, is frequently used to determine the specific
heat capacity of a solid, or to measure the enthalpy of a solution
phase reaction. "coffee cup" calorimeterSince the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as the calorimeter and
the value determined is called the calibrating. calorimeter
constantOne way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 90.89 g
zinc to 98.35 °C and carefully
lowers it into a cup containing 80.47 g water at
24.20 °C. She measures the final temperature to be
31.20 °C. Using the accepted value for the specific heat capacity of zinc (0.388), calculate the calorimeter
constant. |

Answer #1

**Heat lost by hot zinc = heat gained by water + heat
gained by calorimeter**

**now we do each in steps**

**Heat lost by hot zinc = specific heat of zinc x mass of
zinc x temperature change**

**= 0.388 J/gC x 90.89 g x ( 98.35 - 31.2) C**

**= 2368 J**

**Heat gained by water = specfici heat of water x mass of
water x temp change**

**= 4.184 J/gC x 80.47g x ( 31.2 - 24.2) C**

**= 2357 J**

**Now using equation we find heat gained by
calorimter**

**2368 = 2357 + heta gained by calorimeter**

**heat gained by calorimeter = 11 J**

**Now heat gained by calorimeter = calorimetr constant x
temp change**

**11 J = Constant x ( 31.2 - 24.2) C**

**Constant = ( 11 J) / ( 31.2 -24.2) C = 1.57
J/C**

**Thus calorimeter constant is 1.57 J / C**

In the laboratory a "coffee cup" calorimeter, or constant
pressure calorimeter, is frequently used to determine the specific
heat of a solid, or to measure the energy of a solution phase
reaction. Since the cup itself can absorb energy, a separate
experiment is needed to determine the heat capacity of the
calorimeter. This is known as calibrating the calorimeter and the
value determined is called the calorimeter constant. One way to do
this is to use a common metal of...

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two parts for one question
-----------------------------------------
In the laboratory a "coffee cup" calorimeter, or constant
pressure calorimeter, is frequently used to determine the specific
heat of a solid, or to measure the energy of a solution phase
reaction. Since the cup itself can absorb energy, a separate
experiment is needed to determine the heat capacity of the
calorimeter. This is known as calibrating the calorimeter and the
value determined is called the calorimeter constant. One way to do
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