Chapter 5, Problem 5.47P

Interpretation Introduction

Interpretation:

Moles of gaseous arsine $\left({\text{AsH}}_{\text{3}}\right)$ that occupy $0.0400\text{L}$ at STP is to be calculated. Also, the density of gaseous arsine is to be determined.

Concept introduction:

Ideal gas law equation is as follows:

$PV=nRT$        (1)

Here,

$P$ is the pressure of the gas.

$V$ is the volume occupied by gas.

$n$ is the number of moles of gas.

$T$ is the temperature in Kelvin.

$R$ is the universal gas constant.

The formula to calculate no. of moles is as follows:

$n=\frac{mass\left(m\right)}{\text{molecular}\text{weight}\left(M\right)}$        (2)

The ideal gas equation can be written as follows:

$PV=\frac{mRT}{M}$

The formula to calculate density is :

$\text{Density}=\frac{m}{V}$        (3)