Question

a- You have 200 g of coffee at 45 0C, Coffee has the same
specific heat as water. How much ice at -10 0C do you need to add
in order to reduce the coffee’s temperature to 30 0

b- A laboratory technician drops a 0.06 kg sample of unknown
solid material, at a temperature of 100 0C, into a calorimeter. The
calorimeter can, initially at 19 0C, is made of 0.2 kg of copper
and contains 0.15 kg of water. The final temperature of the
calorimeter can, and content is 250 Compute the specific heat of
the sample.

Answer #1

You have 200 g of coffee at 45 0C, Coffee has the
same specific heat as water. How much ice at -10 0C do
you need to add in order to reduce the coffee’s temperature to 30
0

You have 200 g of coffee at 55C, Coffee has the same specific
heat as water. How much ice at -5C do you need to add in order to
reduce the coffee’s temperature to 27C?

In the laboratory a student uses a "coffee cup" calorimeter to
determine the specific heat of a metal.
She heats 19.5 grams of tungsten
to 97.80°C and then drops it into a cup containing
78.3 grams of water at 22.58°C.
She measures the final temperature to be
23.20°C.
Assuming that all of the heat is transferred to the water, she
calculates the specific heat of tungsten to
be J/g°C.

You want to cool 0.2 kg of coffee, initially at temperature Th =
80° C, with ice initially at Tc = 0° C. The specific heat of ice is
about 2108 J/kg K, and its latent heat of melting is about 334, 000
J/kg. You may take the specific heats of liquid water and coffee to
be the same: 4187 J/kg K.
A) Assume the coffee and ice form a closed system. You want them to
equilibrate at 40° C....

A piece of aluminum (specific heat 0.910kJ/kg 0C) of
mass 161g at 74 0C is dropped into a Styrofoam cup
filled with 152ml water at 20 0C. What are the final
temperatures of the water and the aluminum? Please use C instead of
0C in your answer.
Hint 1: because the cup is well-insulated, you can assume that
all the heat leaving the aluminum as it cools goes to heating the
water.
Hint 2: How are the final temperature of...

You are given 100 g of coffee (same specific heat as water) at
80.0° C (too hot to drink). In order to cool the coffee to 50.0° C
(neglect heat content of the cup and heat exchanges with the
surroundings) calculate: a. How much tap water at 20.0° C must be
added? b. How much ice (at 0.0° C) must be added? c. How much ice
(at -10.0° C) must be added? 2. How much energy is required to heat...

When a solid dissolves in water, heat may be evolved or
absorbed. The heat of dissolution
(dissolving) can be determined using a coffee cup
calorimeter.
In the laboratory a general chemistry student finds that when
18.53 g of
Cs2SO4(s) are dissolved in
100.40 g of water, the temperature of the solution
drops from 25.54 to
22.92 °C.
The heat capacity of the calorimeter (sometimes referred to as the
calorimeter constant) was determined in a separate
experiment to be 1.85 J/°C....

1.
When a solid dissolves in water, heat may be evolved or
absorbed. The heat of dissolution
(dissolving) can be determined using a coffee cup
calorimeter.
In the laboratory a general chemistry student finds that when
6.20 g of CsClO4(s)
are dissolved in 115.60 g of water, the
temperature of the solution drops from
22.87 to 19.50 °C.
Based on the student's observation, calculate the enthalpy of
dissolution of CsClO4(s) in
kJ/mol.
Assume the specific heat of the solution is...

A)In the laboratory a student uses a "coffee cup" calorimeter to
determine the specific heat of a metal.
She heats 19.3 grams of chromium
to 98.47°C and then drops it into a cup containing
81.8 grams of water at 23.17°C.
She measures the final temperature to be
24.97°C.
Assuming that all of the heat is transferred to the water, she
calculates the specific heat of chromium to be
__________________ J/g°C.
B) An electric range burner weighing 616.0
grams is turned...

In a calorimetry experiment to determine the specific heat
capacity of a metal block, the following data was recorded:
Quantity
Mass of the metal block
0.50 kg
Mass of empty calorimeter + Stirrer
0.06 kg
Mass of calorimeter + stirrer + water
0.20 kg
Mass of water
0.14 kg
Initial Temperature of metal block
55.5 ⁰C
Initial Temperature of water and calorimeter
22 ⁰C
Final Temperature of block- water system
27.4 ⁰C
Take the specific heat capacity of water to...

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