   # Calculate ∆ H° for the reaction 2 K ( s ) + 2 H 2 O ( l ) → 2 KOH ( a q ) + H 2 ( g ) A 5.00-g chunk of potassium is dropped into 1.00 kg water at 24.0°c. What is the final temperature of the water after the preceding reaction occurs? Assume that all the heat is used to raise the temperature of the water. (Never run this reaction. It is very dangerous; it bursts into flame!) ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 7, Problem 98AE
Textbook Problem
1592 views

## Calculate ∆H° for the reaction 2 K ( s ) + 2 H 2 O ( l ) → 2 KOH ( a q ) + H 2 ( g ) A 5.00-g chunk of potassium is dropped into 1.00 kg water at 24.0°c. What is the final temperature of the water after the preceding reaction occurs? Assume that all the heat is used to raise the temperature of the water. (Never run this reaction. It is very dangerous; it bursts into flame!)

Interpretation Introduction

Interpretation: Standard enthalpy change of the reaction and final temperature of water after proceeding reaction to be calculate.

Concept introduction

Standard Enthalpy change ( ΔH0 ): The heat change when molar quantities of reactants as specified by chemical equation to form a product at standard conditions.

Standard condition: 250C and 1 atmosphere pressure.

### Explanation of Solution

Explanation

Given: Standard state value for given substance in the reaction are,

 Substance and state         ΔHf0 kJ / mol KOH(aq)                          - 481 H2(g)                                      0 K(s)                                       0 H2O(l)                                -286

To calculate standard enthalpy change for given reaction.

The standard enthalpy change for given reaction is -390kJ.

ΔH0 = np ΔHf0,productnr ΔHf0,reactant

=  2(-481kJ) -2(-286 kJ)

= -390 kJ

2K(s)+2H2O(l)2 KOH(aq)+H2(g)

The standard state of some compounds that present in the reaction are given

### Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

#### The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts
Which is required as part of hemoglobin? iron calcium vitamin C potassium

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

(Chemical Connections 30C) What is the Zone Diet?

Introduction to General, Organic and Biochemistry

True or false? A transgenic organism can pass a foreign gene to offspring.

Biology: The Unity and Diversity of Life (MindTap Course List)

A capacitor with very large capacitance is in series with another capacitor with very small capacitance. What i...

Physics for Scientists and Engineers, Technology Update (No access codes included) 