   Chapter 4, Problem 4.55PAE Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
ISBN: 9781337398909 Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
ISBN: 9781337398909
Textbook Problem

Hydrazine, N2H4, is a weak base and can react with an acid such as sulfuric acid:   2 N 2 H 4 ( aq )   +  H 2 SO 4 ( aq )   →  2 N 2 H 5 + ( aq )   +  SO 4 − 2 ( aq ) What mass of hydrazine can react with 250. mL 0.225 M H2SO4?

Interpretation Introduction

Interpretation:

Mass of hydrazine needed to be determined.

Concept introduction:

• Equivalence point is achieved at equimolar conditions.
• Molarity measures molar concentration.

Given:

MolarityH2 SO4=0.225 MVolumeH2 SO4=250mL

Explanation

When performing calculations with molar concentration (molarity) it is much easier to change all units to moles.

Step 1: Balance Reaction

Reaction is already balanced

Step 2: Change all amounts to mol

molH2SO4=Molarity ×Volume=(0.225M)×(250mL)×( 1L 1000mL)molH2SO4=0.05625mol

Step 3: Relate stoichiometry

Ratio=2:1

molacid=2×(0

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