2. An almond weighs 0.823 grams. When the almond is burned in a calorimeter that co 124.2 grams of water, the water temperature changes from 23.5 °C to 45.7 °C. The water MSDT "uncombusted remains" of the almond weighs 0.615 grams. Q: amount of heat absorbed by liquid iwater a) Calculate the change in temperature (AT) of the water. 2 m: mass of liquid water s specific heat of liquid water AT: Change in temper" 5.7°C-235%= 22.2°C b) Calculate the amount of energy that was released from the almond sample. Assume that all of the energy released from the almond was transferred to the water. M:R42 Use the specific heat (S) of water (1.000 cal/g °C), the mass of the water that was in watters: the flask, and the temperature change (AT) of the water to calculate the amount of energy (0) that was transferred to the water, and thus the amount of energy that was Qalmond-q water released from almond. Cal 2g x1.000 9°C X22.2°C ● =2757.21 cal =1-2757 cal amount of heat released from almond is 2757 calories =2757.24 cal c) Calculate the mass of the almond that was "completely combusted". This is done by subtracting the mass of "uncombusted remains" of the almond from the original mass of the almond. Massot uncombusted of almond: 0.615- Original mass of almond; 0.8239 Mass of completely combusted of almond: 0.8239-0.6159
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
will you help me with number 2 questions, please?
![At=trinal-t
AT=(43.2-22)
21.2°C
PRELAB QUESTIONS:
S=1.00 cal/19°C
1. How much energy is required to raise 125 grams of water from 22.0 °C to 43.2 °C? The
specific heat (S) of water is 1.000 cal/g °C. M.S.AT
125 g x 1.0 Cal
дос
x 21.2°C
(tinitial)
9=12650 cal
2. An almond weighs 0.823 grams. When the almond is burned in a calorimeter that contains
124.2 grams of water, the water temperature changes from 23.5 °C to 45.7 °C. The water MSDT
"uncombusted remains" of the almond weighs 0.615 grams. Q: amount of heat absorted by liquid
a) Calculate the change in temperature (AT) of the water.
iwater
mi mass of liquid water
T₁=23.52
TO US.TC
T₂-1₁ = 45.7°C-235° = 22.2°C
●
m=1259
Ti=22.0°C
te=43.2°C.
b) Calculate the amount of energy that was released from the almond sample.
Assume that all of the energy released from the almond was transferred to the water.
Specific teat liquid watter,s:
1.00 cal/g °C
AT:22.2°C
Q=M.SOT
124.2g x1.000
Massliquid 1₂0,m: 1242 Use the specific heat (S) of water (1.000 cal/g °C), the mass of the water that was in
the flask, and the temperature change (AT) of the water to calculate the amount of
energy (Q) that was transferred to the water, and thus the amount of energy that was
Qalmond-quater
released from almond.
= 2757,24 cal
=-2757 cal
amount of heat released from
almond is 2757 calories
=2757.24 cal
c) Calculate the mass of the almond that was "completely combusted". This is done by
subtracting the mass of "uncombusted remains" of the almond from the original mass of
the almond.
si specific heat of liquid water.
AT: Change in temper"
Cal
9°C X22.2°C
Original mass of almond: 0.8239
Mass of uncombusted of almond: 0.6159
Mass of completely combusted of almond:
0.8239-0.6159
= 0.208
d) Calculate the energy per gram of almonds by dividing the energy that was released from
the almond (from part b) by the mass of the almond that was "completely combusted"
(from part c).
Gl
Amount of heat released from almond q almond: 2757
mass of completely combusted of almond: 0.208g
DH=2757 Cal
0.2089
-13255.cal/g
-1.32x10¹ cal/g
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