Chapter 5, Problem 145AE

a)

Interpretation Introduction

Interpretation:Whether below statement is true or false should be determined.

“If number of moles of gas is doubled, volume will be doubled with constant temperature and pressure.”

Concept introduction:Avogadro’s law says that at constant temperature and pressure, volume of gas is directly proportional to amount or number of moles of gas. Mathematical expression for Avogadro’s law is as follows:

  $V=an$

Where,

• $V$ is volume of gas.
• $n$ is moles of gas.
• $a$ is constant.

b)

Interpretation Introduction

Interpretation: Whether below statement is true or false should be determined.

“If temperature of gas increases from $25°\text{C}$ to $50°\text{C}$ , volume of gas would double if pressure and number of moles of gas remains constant.”

Concept introduction:According to Charles’s law, volume and temperature are directly related to each other if amount and pressure of gas is kept constant. Mathematical expression for Charles’s law is as follows:

  $V=bT$

Where,

• $b$ is constant.

c)

Interpretation Introduction

Interpretation: Whether below statement is true or false should be determined.

“Device that measures atmospheric pressure is barometer.”

Concept introduction:Force per unit area is called pressure. Its SI unit is Pascal. Expression for pressure is as follows:

  $\text{Pressure}=\frac{\text{Force}}{\text{Area}}$

d)

Interpretation Introduction

Interpretation: Whether below statement is true or false should be determined.

“If volume of gas decreases by one half, pressure would double if number of moles and temperature of gas remain constant.”

Concept introduction:Boyle’s law describes inverse relationship between volume and pressure of any gas. Expression for Boyle’s law is as follows:

  $PV=k$

Where,

• $k$ is constant.