In: Chemistry

**Part A**

It takes 47.0 J to raise the temperature of an 9.50 g piece of unknown metal from 13.0∘C to 24.8 ∘C. What is the specific heat for the metal?

**Express your answer with the appropriate units.
Cs=**

Parts B and C

The next two questions pertain to silver. They have nothing to do with unknown metal described in Part A.

**Part B**

The molar heat capacity of silver is 25.35 J/mol⋅∘C. How much energy would it take to raise the temperature of 9.50 g of silver by 19.5 ∘C?

**Express your answer with the appropriate units.
q=**

**Part C**

What is the specific heat of silver?

**Express your answer with the appropriate
units.**

Part A

Heat required = mass * specific heat * change in temperature

In the given problem, heat required = 47 J, mass = 9.5 g, temp
change = 24.8-13= 11.8 ^{o}C

specific heat = 47 J/ 9.5 g * 11.8 ^{o}C = 0.42 J/
g/^{o}C

-----------------------------------------------------------------------------------------

Part B

moles of meatl present = 9.5g / 107.86 = 0.088 moles

heat required = moles * molar specific heat * raise in temperature

= 0.088 * 25.35 * 19.5 = 43.50 J

--------------------------------------------------------------------------

Part C

specific heat of silver = molar specific heat / mol. wt =

= 25.35 J/mol.^{o}C / 107.86 = 0.235 J/ g^{o}C

Part A
It takes 55.0 J to raise the temperature of an 10.2 g piece of
unknown metal from 13.0∘C to 25.0 ∘C. What is the specific heat for
the metal?
Part B
The molar heat capacity of silver is 25.35 J/mol⋅∘C. How much
energy would it take to raise the temperature of 10.2 g of silver
by 15.4 ∘C ?
I got 36.9 J for B and its correct
Part C
What is the specific heat of silver?

Compute the total quantity of heat (both in Kcal and J) required
to raise the temperature of 1.00 kg of ice at -10.0 degrees C to
1.00 kg of steam at 110.0 degrees C. Assume no loss of mass or heat
in this process. Note that this will requires several computations
that must be completely added up, and you must include all phase
changes and use the correct specific heats.

A student heats a piece of 130 g of an unknown greyish metal to
a temperature of 99.2 celcius. she places the metal in a styrofoam
cup that contains 55.7 g of water at a temperature of 23.0 celsius.
the hot metal heats up the water in the cup to 31.4 celcius.
calculate the specific heat of the metal?

4. In total, how much heat is required to raise the temperature
of a 450 g sample of water (c = 4.18 J/oC.g) in a
saucepan that has a heat capacity of 300 J/oC from
200C to 75oC
a. If I burn 0.315 moles of hexane (C6H14)
in a bomb calorimeter containing 5.65 liters of water, what’s the
molar heat of combustion of hexane is the water temperature rises
by 55.40 oC? The heat capacity of water is 4.18 J/g...

Calculate the quantity of energy, in joules, required to raise
the temperature of 486 g tin from room temperature, 25.0 °C, to its
melting point, 231.9 °C, and then melt the tin at that temperature.
(The specific heat capacity of tin is 0.227 , and the enthalpy of
fusion of this metal is 59.2 J/g.)

Part B
The amount of boiling water required to raise the temperature of
25.0 kgof water in the bath to body temperature is 4.80 kg.
In this process, the heat lost by the boiling water is equal to
the heat gained by the room-temperature water. How much heat was
transferred in this process?
Express your answer to four significant figures and
include the appropriate units.
n this problem answers are requested to three significant
digits for grading purposes. The true...

1. A 5.88 kg piece of granite with a specific heat of 0.803 J
g-1 °C-1 and a temperature of 85.1 °C is
placed into 2.00 L of water at 19.0 °C. When the granite and water
come to the same temperature, what will the temperature be?
2. The combustion of methane (the chief component of natural
gas) follows the equation:
CH4(g) + 2O2(g) →
CO2(g) + 2H2O(g)
∆H° for this reaction is -802.3 kJ. How many grams of methane...

ONLY NEED SECOND PART
A piece of music wire with a mass of 0.46 g is used in a piano
for the key of F above middle C. The wire is to be tuned to a
fundamental frequency of 349 Hz. Knowing that the wire is anchored
between tightening posts that are 24 cm apart, determine the
tension in the wire required to produce the correct note. (T=53.7
N)
Find the temperature change needed in the room for the
note...

The temperature of a 356 g piece of granite is increased from
32.3°C to 55.5°C. What is its change in entropy (J/K)? The specific
heat capacity of granite is 0.790 J/g.K.

A 100 g piece of granite and a 100 g piece of lead are placed in
an oven that is at 100°C. The initial temperature of the pieces are
25°C. After a couple of minutes, neither one is at 100°C, but which
one is warmer? Which one will reach 100°C first? How much energy
will it take for both of the objects to reach 100°C?

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