Question

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?

Answer #1

**total heat required(q) = m*c*DT + C*DT**

**m = mass of water = 450 g**

**c = specific heat of water = 4.18 j/g.c**

**DT = 200-75**

**C = heat capacity of saucepan = 300 j/c**

**
= 450*4.184*(200-75) + 300*(200-75)**

**
= 272.85 kj**

How much energy (in kJ) is required to raise the temperature of
25.0 g of H2O from –25°C to 25°C ? (ΔH°fus of H2O = 6.02 kJ/mol ;
molar heat capacity of solid H2O = 37.6 J/mol•°C ; molar heat
capacity of liquid H2O = 75.4 J/mol•°C)
(a) 70.7 kJ
(b) 8.73 kJ
(c) 61.9 kJ
(d) 12.3 kJ

How much heat is required to raise the temperature of 230 g
CH3OH(l) from 22.0 to 30.0 ∘C and then vaporize it at 30.0 ∘C? Use
enthalpy of vaporization CH3OH(l) = 38.0 kJmol−1 and a molar heat
capacity of CH3OH(l) of 81.1 Jmol−1K−1.

QUESTION 1
Calculate the heat energy required to raise the temperature of a
cup of water (300 grams) from 25°C to 100°C. Express your answer in
Joules. (Be careful with powers of 10)
A
9.43 x 10e4 J
B
22,500 J
C
2.25 x 10e4 J
D
94,275 x 10e4 J
E
80 J
F
335 J
QUESTION 2
Calculate the heat energy required to raise the temperature of 5
gallons of water from 50 F to 130 F....

(a) How much heat is required to raise by 13.20°C the
temperature of 1.7 kg of water.
(b) How much heat is required to raise by 13.20°C the
temperature of 1.7 kg of iron.

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.550 kg aluminum pot containing 3.50 kg of water
from 25.0°C to the boiling point and then boil away 0.650 kg of
water?
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.600 kg aluminum pot containing 2.00 kg of water
from 40.0°C to the boiling point and then boil away 0.850 kg of
water?
kcal
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?
s

How much heat is required for the following:
a) Raise the temperature from -10°C to 0°C for a 50kg block of
ice.
b) Melt the ice to water
c)Heat the water to 100°C.
d) Evaporate all the water.
e) Compute the total heat supplied.

calculate the amount of heat (in kl) required to raise the
temperature of 79 g sample of ethanol from 298 k to 385 k. the
specific heat capacity of ethanol 2.42 J/g C.the boiling point of
ethanol and delta Hvap are given 78.4 C and 38.56 KJ/mol
**16.6 IS WRONG SOULTION TO THIS QUESTION
Please Help

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.700 kg aluminum pot containing 1.50 kg of water
from 35.0°C to the boiling point and then boil away 0.800 kg of
water?
? kcal
(b)
How long (in s) does this take if the rate of heat transfer is
550 W (1 watt = 1 joule/second (1 W = 1 J/s))?
? s
Please explain each step thoroughly and why, I am really
confused.

How much heat is required to raise the temperature of 20.9 g20.9
g of water from −25 °C−25 °C to 155 °C? the answer are not 1.45
*10^5 and 10.956778 ! you have to calculate be broken 1.down into
five step! heart the ice from -25 c to 0 c
2.melting the ice
3.heating the liquid water from 0c to 100 c
4.100 c to 155 c
0.497 cal/ g c to do this calculate
All this answer 12298.782 and...

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