You may want to reference (Pages 245-246) Section 7.8 while completing this problem. Calcium cyanamide reacts with water to form calcium carbonate and ammonia via the following reaction: CaCN₂ (s) + 3H₂O(1)→ CaCO3(s) + 2NH3(g) How many grams of water are needed to react with 71.0 g CaCN₂? 195] ΑΣΦ mass H₂O = Submit Request Answer Part B How many grams of NH3 are produced from 5.22 g CaCN₂? IVE ΑΣΦ mass NH₂ = Submit Part C Request Answer How many grams of CaCO, form if 156 g water react? 195| ΑΣΦ mass CaCO3 = P Pearson 17 ? ? ? g 09 04 g g
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.
![### Mass Calculations for Chemical Reactions
**Problem Context:**
Calcium cyanamide reacts with water to form calcium carbonate and ammonia via the following reaction:
\[
\text{CaCN}_2(s) + 3\text{H}_2\text{O}(l) \rightarrow \text{CaCO}_3(s) + 2\text{NH}_3(g)
\]
**Tasks:**
1. **Part A:**
- **Objective:** Calculate how many grams of water are needed to react with 71.0 g of CaCN₂.
- **Input Field:** `mass H₂O = _____ g`
- Click "Submit" to verify your answer.
2. **Part B:**
- **Objective:** Determine how many grams of NH₃ are produced from 5.22 g of CaCN₂.
- **Input Field:** `mass NH₃ = _____ g`
- Click "Submit" to verify your answer.
3. **Part C:**
- **Objective:** Identify how many grams of CaCO₃ form if 156 g of water react.
- **Input Field:** `mass CaCO₃ = _____ g`
- Click "Submit" to verify your answer.
This educational activity helps reinforce your understanding of stoichiometry and mass relationships in chemical reactions.
**Note:** Refer to [Pages 245–246] in your textbook for additional information and guidance.
**Resource Links:**
- Review | Constants | Periodic Table (located at the top right of the exercise for quick reference)
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