Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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need help with calculating heat of reaction
Transcribed Image Text:**Educational Website Transcription:**
**Title: Calculating the Heat of Reaction**
**Section: Identifying the Limiting Reagent**
A critical step in determining the heat of reaction involves identifying the limiting reagent. In the current example, sodium hydroxide (NaOH) has been identified as the limiting reagent for the reaction.
**Progress Indicator:**
- Current Task: Part 1 of 4
- Progress Bar: Visible indication of task completion status.
**Section: Calculating the Heat of Reaction**
*Task: Calculate the heat of reaction (in Joules). Round your answer to three significant digits.*
- **Formula Displayed:** The heat of reaction is denoted by \( q_{\text{reaction}} \) and is measured in Joules (J).
- **Input Field:** A text box is provided for entering the numerical value of the calculated heat of reaction. The format specifies multiplying by a power of ten, indicated by a box marked \(\times 10^{}\).
**Navigation:**
- A "Next Part" button is available for proceeding to the subsequent task.
**Note:** No graph or diagram is present in this section.
![Below is the transcribed data and explanation that might appear on an educational website:
---
### Chemistry Experiment: Reaction Between Sodium Hydroxide and a Monoprotic Acid
**Collected Data:**
- **Concentration of HA ([HA] M):** 4.75 M
- **Initial Temperature of HA (°C):** 21.0 °C
- **Volume of HA (mL):** 56.2 mL
- **Concentration of NaOH ([NaOH] M):** 2.45 M
- **Initial Temperature of NaOH (°C):** 21.0 °C
- **Volume of NaOH (mL):** 85.0 mL
- **Final Solution Temperature (°C):** 34.3 °C
- **Density of Solution (g/mL):** 1.70 g/mL
- **Specific Heat of Solution (J/g·°C):** 4.004 J/g·°C
- **Calorimeter Constant (J/°C):** 38.76 J/°C
**Task:**
1. **Identify the Limiting Reagent:** For this experiment, you need to determine the limiting reagent. In the provided data, the dropdown suggests that NaOH is the limiting reagent.
**Progress Indicator:**
- The interface displays progress through a "Part: 1 / 4" progress bar, indicating the experiment or task is part one of a four-part series.
**Instructions:**
- Analyze the data and determine the limiting reagent by using stoichiometric calculations and considering the initial concentrations and volumes of the reactants.
### Explanation of the Data:
The table provides initial experimental setup data and measured outcomes for the reaction between a monoprotic acid (HA) and Sodium Hydroxide (NaOH). The experiment begins with both reactants at the same initial temperature. A noticeable increase in the solution's final temperature reflects the exothermic nature of the reaction. Understanding the limiting reagent is crucial for predicting the extent of the reaction.
---
The educational platform uses this data to guide students through the process of identifying the limiting reagent, enhancing comprehension of chemical reactions and stoichiometry.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9ce1fa32-745b-446a-832b-1aa8581f8e40%2F2e24d27d-4ae9-4cb4-9236-e8a71ec37fc1%2Fqpei1gt_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Below is the transcribed data and explanation that might appear on an educational website:
---
### Chemistry Experiment: Reaction Between Sodium Hydroxide and a Monoprotic Acid
**Collected Data:**
- **Concentration of HA ([HA] M):** 4.75 M
- **Initial Temperature of HA (°C):** 21.0 °C
- **Volume of HA (mL):** 56.2 mL
- **Concentration of NaOH ([NaOH] M):** 2.45 M
- **Initial Temperature of NaOH (°C):** 21.0 °C
- **Volume of NaOH (mL):** 85.0 mL
- **Final Solution Temperature (°C):** 34.3 °C
- **Density of Solution (g/mL):** 1.70 g/mL
- **Specific Heat of Solution (J/g·°C):** 4.004 J/g·°C
- **Calorimeter Constant (J/°C):** 38.76 J/°C
**Task:**
1. **Identify the Limiting Reagent:** For this experiment, you need to determine the limiting reagent. In the provided data, the dropdown suggests that NaOH is the limiting reagent.
**Progress Indicator:**
- The interface displays progress through a "Part: 1 / 4" progress bar, indicating the experiment or task is part one of a four-part series.
**Instructions:**
- Analyze the data and determine the limiting reagent by using stoichiometric calculations and considering the initial concentrations and volumes of the reactants.
### Explanation of the Data:
The table provides initial experimental setup data and measured outcomes for the reaction between a monoprotic acid (HA) and Sodium Hydroxide (NaOH). The experiment begins with both reactants at the same initial temperature. A noticeable increase in the solution's final temperature reflects the exothermic nature of the reaction. Understanding the limiting reagent is crucial for predicting the extent of the reaction.
---
The educational platform uses this data to guide students through the process of identifying the limiting reagent, enhancing comprehension of chemical reactions and stoichiometry.
Expert Solution
Step 1
Given that
Initial temperature = 21.0 °C
Final Temperature = 34.3 °C
Change in temperature = 34.3 °C – 21.0 = 13.3 °C
Total volume of the solution = 56.2 + 85.0 = 141.2 mL
Density of the solution = 1.70 g/mL
Mass of the solution = 141.2 mL * 1.70 g/mL = 240.04 g
Specific heat of the solution = 4.004 J/(g.°C)
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