CuSO4 (aq) + Zn(s) → Cu(s) + ZnSO4(aq) The single-replacement reaction above produces 140.0 g of copper and an unknown concentration of zinc sulfate. With excess CuSO4, what mass of Zn was used? Molar mass of Cu: 63.55 g/mol Molar mass of Zn: 65.38 g/mol Answer: g of zinc (Use 4 sig figs)
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.
![CUSO4 (aq) + Zn(s)
→ Cu(s) + ZnSO4(aq)
The single-replacement reaction above produces 140.0 g of copper and an unknown concentration of zinc sulfate. With
excess CuS04, what mass of Zn was used?
Molar mass of Cu: 63.55 g/mol
Molar mass of Zn: 65.38 g/mol
Answer:
g of zinc (Use 4 sig figs)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0101b31d-bd27-4d77-86ec-8526d5d0aa99%2Feba358d2-97f4-48db-ab3a-ecbc8c2c7f16%2F56yeu2_processed.png&w=3840&q=75)
![A student (Sam) is helping a friend (Devin) solve a stoichiometry problem. Devin needs to know how many liters of
nitrogen monoxide (NO) gas are created at STP when 32.2 g of solid copper reacts with excess nitric acid.
ЗСи(s) + 8HNO3 (ад) — зСи(NO3); (аq) + 4H20() + 2NO(9)
Devin knows they should put 32.2 g Cu down fırst, and they also know they need to convert from grams to something
else. Sam provides a clue to Devin: they will need 3 conversion factors (which are empty, below).
What does Devin need in order to complete the first conversion factor? Below is what Devin has so far:
32.2 g Cu
1
Avogadro's number
The molar mass of nitrogen monoxide
The STP volume of
gas (22.4 L/mol)
The molar mass of copper
Coefficients from the balanced equation (molar ratio)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0101b31d-bd27-4d77-86ec-8526d5d0aa99%2Feba358d2-97f4-48db-ab3a-ecbc8c2c7f16%2Fmx7zyzt_processed.png&w=3840&q=75)
![](/static/compass_v2/shared-icons/check-mark.png)
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 1 images
![Blurred answer](/static/compass_v2/solution-images/blurred-answer.jpg)
![Introduction to General, Organic and Biochemistry](https://www.bartleby.com/isbn_cover_images/9781285869759/9781285869759_smallCoverImage.gif)
![Chemistry for Engineering Students](https://www.bartleby.com/isbn_cover_images/9781337398909/9781337398909_smallCoverImage.gif)
![Introductory Chemistry: A Foundation](https://www.bartleby.com/isbn_cover_images/9781337399425/9781337399425_smallCoverImage.gif)
![Introduction to General, Organic and Biochemistry](https://www.bartleby.com/isbn_cover_images/9781285869759/9781285869759_smallCoverImage.gif)
![Chemistry for Engineering Students](https://www.bartleby.com/isbn_cover_images/9781337398909/9781337398909_smallCoverImage.gif)
![Introductory Chemistry: A Foundation](https://www.bartleby.com/isbn_cover_images/9781337399425/9781337399425_smallCoverImage.gif)
![Chemistry for Engineering Students](https://www.bartleby.com/isbn_cover_images/9781285199023/9781285199023_smallCoverImage.gif)
![Chemistry: Principles and Reactions](https://www.bartleby.com/isbn_cover_images/9781305079373/9781305079373_smallCoverImage.gif)
![Introductory Chemistry: A Foundation](https://www.bartleby.com/isbn_cover_images/9781285199030/9781285199030_smallCoverImage.gif)