Question

Iron has a molar heat of about 25 J mol-K. Calculate the beat capacity of a block of iron whose volume is 1 m. Compare the result with that for the same volume of water. (The relative atomic mass of iron is 55.845 and its density is 7.86 x 10 kg m)

Answer #1

1- The molar mass and molar heat capacity of aluminum is 27.0
g/mol and 24.3 J/(mol K), respectively. If a 27.0-g Al sample, at
300. K, absorbed 168 J of heat, what is its final temperature?
2- The molar mass and molar heat capacity of aluminum is 27.0
g/mol and 24.3 J/(mol K), respectively. If a 27.0-g Al sample, at
300. K, absorbed 152 J of heat, what is its final temperature?
3- 100. g water, at 20 C, and...

A 78 kg block of Iron (Specific Heat Capacity 348 J/kg.K) at
temperature T kelvin is inserted into 5 kg of water (Specific Heat
Capacity 4005 J/kg.K and initial temperature is 300 K). Final
temperature of the mixture is 308 K. Assuming no heat loss to
surrounding calculate the initial temperature of the iron block:
_______ K

(a) The molar heat capacity of lead is 26.44 J K-1 mol-1. How
much energy must be supplied (by heating) to 100 g of lead to
increase it’s temperature by 10.0°C? (b) The molar heat capacity of
sodium is 28.24 J K-1 mol-1. What is its specific heat capacity?
(c) The specific heat capacity of copper is 0.384 J K-1 g-1. What
is its molar heat capacity?

1. The specific heat of iron metal is 0.450 J/g⋅K. How many J of
heat are necessary to raise the temperature of a 1.05 −kg block of
iron from 28.0 ∘Cto 85.0 ∘C?
2. A 1.80-g sample of phenol (C6H5OH) was burned in a bomb
calorimeter whose total heat capacity is 11.66 kJ/∘C. The
temperature of the calorimeter plus contents increased from
21.36∘Cto 26.37∘C.
A. Write a balanced chemical equation for the bomb calorimeter
reaction.
B. What is the heat...

#21.
(a) What is the molar heat capacity of liquid water?
75.2 J/mol oC (this one is correct just need help with B
and C)
(b) What is the heat capacity of 8.58 mol of liquid water?
___kJ
(c) How many kJ of heat are needed to raise the temperature of 3.02
kg of water from 35.9 oC to 74.9 oC?
___kJ

Q 4. A metal block of heat capacity 600 J K-1
loses 1 M.J of heat energy to its surroundings. Find the decrease
in temperature.
Q5. One mega joule of heat energy is supplied to a piece
of iron and raises its temperature from
20?C to
200?C. Find the mass of the piece
of iron.( Specific heat capacity of iron
=451Jkg-1K-1
Q6. 30grams of water at
100?C are added to 100 grams of
water at 20?C. If there is no...

The specific heat capacity of aluminium is C aluminium= 900
J/kgC, and that of iron is C iron=450J/kgC. Samples of pure
aluminium with mass M aluminium =50 kg and iron with mass M iron=
100 kg are prepared, along with a number of fancy boxes through
wich heat does not flow. At an initial time, both the aluminium and
iron samples are at T initial= 20C.
e)Determine the effective specific heat capacity of the combined
samples.
f)ONe half of the...

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...

A 2.50-kg block of hot iron (cFe = 0.45 J/g K; Tin = 300. oC) is
dropped in cold water (Tin = 20 oC) to cool quickly.
1) how much heat needs to be absorbed to cool
the iron block to 25 oC?
A) 309 J B) 309 kJ C) 618 J D) 618 kJ E) None of the above
2) How much cold water will be needed?
A) 14.8 g B) 14.8 kg C) 14.8 m3 D) 14,800 L...

A heat exchanger uses oil
(cp = 1880 J kg-1 K-1) at an
initial temperature of 205°C to heat up water with heat capacity of
1 kcal kg-1 K-1, and density = 0.998 g
cm-3, flowing at 0.00376 m3 min-1
from 16°C to 44°C. The configuration of the heat exchanger is in
countercurrent. The oil mass flow rate is 270 kg
h-1.
(1 cal = 4.18 J)
(i) What is the heat
transfer area required for an overall heat transfer...

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