   Chapter 13, Problem 102QAP ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
6 views

# onsider the following reaction:msp;  Zn ( s ) + 2HCl ( a q )   ZnCl 2 ( a q ) + H 2 ( g ) at mass of zinc metal should be taken so as to produce 125 mL of H 2 meawured at STP when reactant with excess hydrochloric acid?

Interpretation Introduction

Interpretation:

The mass of zinc metal should be calculated.

Concept Introduction:

According to ideal gas equation:

PV=nRT

Here, P is pressure, V is volume, n is number of moles, R is Universal gas constant and T is temperature.

The value of Universal gas constant can be taken as 0.082 L atm K1 mol1.

Mass of gas can be calculated from number of moles and molar mass as follows:

m=n×M

Here, n is number of moles, m is mass and M is molar mass.

Explanation

Given Information:

The volume of hydrogen gas is 125 mL.

Calculation:

The balanced chemical reaction is as follows:

Zn(s)+2HCl(aq)ZnCl2(aq)+H2(g)

To calculate the mass of zinc metal, number of moles hydrogen gas should be calculated using the ideal gas equation as follows:

n=PVRT

At STP, the value of temperature is 273.15 K and pressure is 1 atm thus, volume can be calculated using the ideal gas equation as follows:

n=(1 atm)(125 mL)(103 LmL)(0.082 L atm K1 mol1)(273

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