Chapter 18, Problem 18.48SP

(a)

Interpretation Introduction

Interpretation:

The density of hydrogen in ${\text{TiH}}_{\text{2}}$ has to be given and the value should be compared with the density of liquid hydrogen.

Concept introduction:

Density of substance can be calculated using following formula,

$Density=\frac{mass}{volume}$

(b)

Interpretation Introduction

Interpretation:

The volume of hydrogen at STP in cubic centimetres has to be calculated.

Concept introduction:

Ideal gas Equation:

Any gas is described by using four terms namely pressure, volume, temperature and the amount of gas. Thus combining three laws namely Boyle’s, Charles’s Law and Avogadro’s Hypothesis the following equation could be obtained. It is referred as ideal gas equation.

$\begin{array}{l}\text{V }\propto \frac{\text{nT}}{\text{P}}\\ \text{V = R}\frac{\text{nT}}{\text{P}}\\ \text{PV = nRT}\end{array}$

Where,

$\begin{array}{l}\text{n = moles}\text{of}\text{gas}\\ \text{P = pressure}\\ \text{T = temperature}\\ \text{R = gas }\text{constant}\end{array}$