What quantity in moles of KBr are in 70.0 grams of KBr?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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![### Chemistry Problem: Moles Calculation
**Question:**
What quantity in moles of KBr are in 70.0 grams of KBr?
**Input Method:**
The interface provided features a digital keypad with numbers (1-9) and additional control buttons. The user can input their answer in moles using this keypad. The controls include:
- `1 2 3`
- `4 5 6`
- `7 8 9`
- `+/- . 0`
- `x 10` for scientific notation input
- `C` for clearing the input
- `⌫` for backspace
**Instructions:**
1. Determine the molar mass of KBr.
2. Use the formula:
\[
\text{Moles} = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}}
\]
3. Compute the number of moles for 70.0 grams of KBr.
4. Input the answer using the digital keypad provided.
**Example Calculation:**
1. Find the molar mass of KBr:
- Potassium (K): 39.1 g/mol
- Bromine (Br): 79.9 g/mol
- Total: 39.1 + 79.9 = 119.0 g/mol
2. Compute moles for 70.0 grams:
\[
\text{Moles} = \frac{70.0 \text{ g}}{119.0 \text{ g/mol}} \approx 0.588 \text{ mol}
\]
Make sure to enter your final answer rounded to three significant figures (0.588 mol in this example) using the provided digital keypad interface.
**Graphical Interface:**
The digital keypad simplifies input on electronic devices, and the large, clearly marked keys help avoid mistakes. The options to clear or delete the last entry make corrections easy. The interface is user-friendly, designed to assist students in focusing on the calculation rather than input difficulties.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0366015e-0c78-4e2d-ab3b-eac6ad985c89%2Fac11d6a2-444e-4374-a3b0-48fc76d916a9%2F82qfryr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Chemistry Problem: Moles Calculation
**Question:**
What quantity in moles of KBr are in 70.0 grams of KBr?
**Input Method:**
The interface provided features a digital keypad with numbers (1-9) and additional control buttons. The user can input their answer in moles using this keypad. The controls include:
- `1 2 3`
- `4 5 6`
- `7 8 9`
- `+/- . 0`
- `x 10` for scientific notation input
- `C` for clearing the input
- `⌫` for backspace
**Instructions:**
1. Determine the molar mass of KBr.
2. Use the formula:
\[
\text{Moles} = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}}
\]
3. Compute the number of moles for 70.0 grams of KBr.
4. Input the answer using the digital keypad provided.
**Example Calculation:**
1. Find the molar mass of KBr:
- Potassium (K): 39.1 g/mol
- Bromine (Br): 79.9 g/mol
- Total: 39.1 + 79.9 = 119.0 g/mol
2. Compute moles for 70.0 grams:
\[
\text{Moles} = \frac{70.0 \text{ g}}{119.0 \text{ g/mol}} \approx 0.588 \text{ mol}
\]
Make sure to enter your final answer rounded to three significant figures (0.588 mol in this example) using the provided digital keypad interface.
**Graphical Interface:**
The digital keypad simplifies input on electronic devices, and the large, clearly marked keys help avoid mistakes. The options to clear or delete the last entry make corrections easy. The interface is user-friendly, designed to assist students in focusing on the calculation rather than input difficulties.
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