Title Gas Laws (Introduction and Abstract) Nature Gases Theoretical Physics Mathematical Physics Applied Statistics 88.0 KB 2
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: 07-07-14

ABSTRACT

In this experiment on gas laws, we are to observe the behavior of gases and understand the
principles of Combined Gas Law and Graham’s Law of Diffusion. There are two experiments: one focused
on Combined Gas Law where an Erlenmeyer flask set-up is used where heating and cooling procedures
are done to determine variables needed, such as temperature, volume, pressure and percentage
difference; while on the other hand, Graham’s Law of Diffusion is demonstrated using a long glass tube
where cottons dipped in Conc. HCl and Conc. NH4OH were placed on each end to be observed and be
able to determine the diffusion rate as well as percentage difference. The pressure, volume, temperature,
diffusion rates, ratios and percentage differences were calculated, obtained, and identified. All the
methods used were effective in observing the behavior of gases and understanding the principles of the
gas laws.

INTRODUCTION

Ideal gas is a gas that obeys the ideal gas law, which is a combination of Avogadro’s Law and
Combined Gas Law. The ideal gas law is approximately true for all gases under laboratory conditions
such as room temperature and one atmosphere pressure. Since the molecules of real gases move
independently and interact weakly with one another, they behave nearly ideally under normal conditions.
The equation of ideal gas is expressed mathematically as:

Pv = nRT

Where: P = pressure n = number of moles T = temperature

. V = volume R = gas constant (~ 0.0821 L atm / K mol)

Before the ideal gas was formulated, scientists worked on how the volume of gases was affected
by pressure, temperature, number of mole of gas. Example of which is Boyle’s Law, which relates
volumes of gas to its temperature; where here it is seen that volume inversely proportional to the pressure
and is mathematically expressed as:

PV = a constant or P1V1= P2V2

For a fixed volume of gas at a constant pressure, volume is directly proportional to the
temperature in kelvins (K), it is the Charles’ Law:

Experiment no. 8
Gas Laws

Guillermo, Janina Suzette C.
Escudero, Angela Julia R.

De La Salle University –
Dasmariñas

Dasmariñas, Cavite Philippines