LAB 8 Pre-Lab Questions portions of lab adapted from various online and reference sources 1. Fill in the missing parts of this chemical equation. Remember that a chemical with a dot in the middle is called a hydrate. The arrow means that heat will be applied, which will drive off the water from the hydrate. No physical states needed, but your final answer should be balanced. CuSO4.5H₂O -> CUSO4 + 2. Calculate the molar mass of the hydrate ZnSO4.7H₂O.
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.
![LAB 8 Pre-Lab Questions
portions of lab adapted from various online and reference sources
1. Fill in the missing parts of this chemical equation. Remember that a chemical with a dot in the middle is called a
hydrate. The arrow means that heat will be applied, which will drive off the water from the hydrate. No physical states
needed, but your final answer should be balanced.
CuSO4.5H2O -> CUSO4 +
2. Calculate the molar mass of the hydrate ZnSO4.7H₂O.
3. A student took 4.92 g of hydrated magnesium sulfate crystals (MgSO4 xH₂O), but didn't write down how many water
molecules were attached, hence "x."
a. Write a balanced chemical equation that shows a decomposition of this molecule if we were to apply heat. No physical
states needed, but your final answer should be balanced (you can use x in balancing).
b. The student heated the hydrate. Once heating was complete, the dish had 2.40 g of dried magnesium sulfate. How
much water in grams did the student drive off from heating? Show work.
c. Convert your answer in (b) to moles of water. Show work.
d. Convert 2.40 g of MgSO4 to moles of MgSO4. Show work.
e. Pick the smallest number you got between answers (c) and (d). Divide both answers (c) and (d) by the smallest (jus
like we did with empirical formula problems). Show work.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdac12a6b-1584-4950-bc08-2cef7d1dd991%2Fe5413785-9c3f-42b0-9fa6-3ac4882019a3%2Fjklqd5l_processed.jpeg&w=3840&q=75)
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