Question

Problem 5.54 A 100.0-g bar of gold is heated from 25 ∘C to 50 ∘C during which it absorbs 322 J of heat. Assume the volume of the gold bar remains constant. |
Based on the data, calculate the specific heat of
Au( Express your answer to two significant figures and include the appropriate units.
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Suppose that the same amount of heat is added to two 10.0-g blocks of metal, both initially at the same temperature. One block is gold metal, and one is iron metal. Which block will have the greater rise in temperature after the addition of the heat?
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What is the molar heat capacity of Au( Express your answer to two significant figures and include the appropriate units.
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Answer #1

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14
An unknown mass of each of the following substances, initially
at 21.0 ∘C, absorbs 1950 J of heat. The final temperature is
recorded as indicated. Find the mass of each substance.
Part A
a. Pyrex glass (Tf= 55.7 ∘C)
Express your answer using two significant figures.
m=
g
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deducted
Part B
sand (Tf= 62.0 ∘C)
Express your answer using two significant figures.
m=
g
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Part...

A 1.4 kg block of iron at 36 ∘C is rapidly heated by a torch
such that 16 kJ is transferred to it. What temperature would the
block of iron reach assuming the complete transfer of heat and no
loss to the surroundings? If the same amount of heat was quickly
transferred to a 830 g pellet of copper at 24 ∘C, what temperature
would it reach before losing heat to the surroundings? qcs,
Fe(s)cs, Cu(s)===mcsΔT0.450 J/g⋅∘C0.385 J/g⋅∘C Express the...

A 1.4 kg block of iron at 21 ∘C is rapidly heated by a torch
such that 17 kJ is transferred to it. What temperature would the
block of iron reach assuming the complete transfer of heat and no
loss to the surroundings? If the same amount of heat was quickly
transferred to a 890 g pellet of copper at 28 ∘C, what temperature
would it reach before losing heat to the surroundings?
qcs, Fe(s)cs,
Cu(s)===mcsΔT0.450 J/g⋅∘C0.385
J/g⋅∘C
Express the...

Problem 11.46
The fluorocarbon compound C2Cl3F3 has a normal boiling point of
47.6 ∘C. The specific heats of C2Cl3F3(l) and
C2Cl3F3(g) are 0.91 J/g⋅K and 0.67 J/g⋅K, respectively.
The heat of vaporization for the compound is 27.49 kJ/mol.
Part A
Calculate the heat required to convert 72.0 g of C2Cl3F3 from a
liquid at 10.30 ∘C to a gas at 76.05 ∘C.
Express your answer using two significant figures.
Q =
14.83
kJ
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Incorrect; Try Again; 6...

A 20.95 g piece of iron and a 25.20 g piece of gold at 100.0
celsius were dropped into 570.0 ml of water at 27.95 celsius. The
molar heat capacities of iron and gold are 25.19 J/(mol*celsius)
and 25.41 J/(mol*celsius), respectively. What is the final
temperature of the water and pieces of metal?

A student heats up a 2.5-g gold block (cs = 0.13 J/g-K) from
13.5 oC to 22.8 oC.
a. What is the heat capacity of this gold block?
b. What is the molar heat capacity of gold?
c. How many joules are required to heat this gold block from
13.5 oC to 22.8 oC?
d. If this gold block is submerged into 50 mL of water (cs =
4.18 J/g°-K) at 50 oC after it reaches 22.8 oC, indicate the...

THERE IS NO OTHER INFORMATION GIVEN BESIDES 298K
Exercise 19.87
The following reactions are important ones in catalytic
converters in automobiles. Calculate ΔG∘for each at 298 K.
Predict the effect of increasing temperature on the magnitude of
ΔG∘.
Part A
2CO(g)+2NO(g)→N2(g)+2CO2(g)
Express your answer using four significant figures.
ΔG∘rxn =
kJ
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Part B
ΔG will increase with increasing temperature.
ΔG will decrease with increasing temperature.
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Part C
5H2(g)+2NO(g)→2NH3(g)+2H2O(g)
Express your answer using four significant...

A block of an alloy of mass 37.0 g and at a temperature of 15.51
°C is placed in a calorimeter containing 41.0 g of water at 81.93
°C. If the final temperature of the alloy and water is 39.77 °C,
calculate the specific heat (in J/g/K) of the metal. The specific
heat of water is 4.184 J/g/K. Express your answer to ***(((three
significant figures)) in scientific notation.

A block of an alloy of mass 25.0 g and at a temperature of 6.52
°C is placed in a calorimeter containing 35.0 g of dichlorobenzene
at 84.98 °C. If the final temperature of the alloy and
dichlorobenzene is 48.00 °C, calculate the specific heat (in J/g/K)
of the metal. The specific heat of dichlorobenzene is 1.13 J/g/K.
Express your answer to three significant figures in scientific
notation.

A 54-cm-long, 500 g bar rotates in a horizontal plane on an axle
that passes through the center of the bar. Compressed air is fed in
through the axle, passes through a small hole down the length of
the bar, and escapes as air jets from holes at the ends of the bar.
The jets are perpendicular to the bar's axis. Starting from rest,
the bar spins up to an angular velocity of 200 rpm at the end of 12...

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