   Chapter 10, Problem 31PS

Chapter
Section
Textbook Problem

Iron reacts with hydrochloric acid to produce iron(II) chloride and hydrogen gas:Fe(s) + 2 HCl(aq) → FeCl2(aq) + H2(g)The H2 gas from the reaction of 2.2 g of iron with excess acid is collected in a 10.0-L flask at 25 °C. What is the pressure of the H2 gas in this flask?

Interpretation Introduction

Interpretation:

The pressure of H2 in the given flask has to be given.

Concept Introduction:

According to ideal gas equation:

PV=nRT

Numberofmoles=massmolarmass

Explanation

Given that:

MassofFe=2.2gVolume=10LTemperature=25°C=298K

The pressure of H2 in the flask in the given conditions can be calculated as

Numberofmoles=massmolarmass=2

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