   Chapter 21.11, Problem 2.3ACP

Chapter
Section
Textbook Problem

What is the hydrogen density (mass H2 per liter) in ammonia borane?

Interpretation Introduction

Interpretation:

To calculate the hydrogen density in ammonia borane.

Concept introduction:

The formula for ammonia borane is H3NBH3. It is an important boron-nitrogen hydride compound and is a source of hydrogen fuel. The other name for ammonia borane is borazane.

It is a colorless white solid and has an atomic mass of 30.865 g.

Density=d=mV

Where m is the mass and V is the volume

Explanation

The hydrogen density in ammonia borane is calculated below.

Given:

The density of ammonia borane is 0.780 g/cm3.

d=mV

For 1 L of solution, the mass of ammonia borane is expressed as,

m=d×V

Substitute the values,

m=(0.780 g/cm3)(1000 cm3)m=780 g

Now,

The molar mass of ammonia borane is 30.865 g.

The atomic mass of six hydrogen atom is 6.047 g

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