It’s a really cold day outside, so to be able to make it through your walk to Morehead Labs you bought a hand warmer packet at Pit Stop. When you get into lab, your TA tells you that you’re warming your hands through the power of chemistry. Typical hand warmers have an iron powder that reacts with oxygen to form iron(III) oxide, which produces the heat for warming your hands. Is the reaction happening in the hand warmer exothermic or endothermic? Why? Assuming for simplicity that the iron powder is just atomic iron, Fe, write and balance the reaction that creates iron (III) oxide in your hand warmers. Given that the heat of formation, ΔHf, of iron (III) oxide is –272.04 kJ/mol, what is the ΔH of the reaction in the hand warmer? d. You do some research and find out that there are 4.42 grams of the iron powder in each packet. How much heat will be released?
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.
It’s a really cold day outside, so to be able to make it through your walk to Morehead Labs you bought a hand warmer packet at Pit Stop. When you get into lab, your TA tells you that you’re warming your hands through the power of chemistry. Typical hand warmers have an iron powder that reacts with oxygen to form iron(III) oxide, which produces the heat for warming your hands.
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Is the reaction happening in the hand warmer exothermic or endothermic? Why?
-
Assuming for simplicity that the iron powder is just atomic iron, Fe, write and balance the reaction that creates iron (III) oxide in your hand warmers.
-
Given that the heat of formation, ΔHf, of iron (III) oxide is –272.04 kJ/mol, what is the ΔH of the reaction in the hand warmer?
d. You do some research and find out that there are 4.42 grams of the iron powder in each packet. How much heat will be released?
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