8/9/2019 Gas Laws (Introduction and Abstract)

1/2

: 07-07-14

ABSTRACT

In this experiment on gas laws, we are to observe the behavior of gases and understand the

principles of Combined as !aw and raham"s !aw of #iffusion$ %here are two experiments: one focused

on Combined as !aw where an &rlenme'er flas( 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, raham"s !aw of #iffusion is demonstrated using a long glass tube

where cottons dipped in Conc$ *Cl and Conc$ +*4* were placed on each end to be observed and be

able to determine the diffusion rate as well as percentage difference$ %he pressure, volume, temperature,

diffusion rates, ratios and percentage differences were calculated, obtained, and identified$ ll 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 obe's the ideal gas law, which is a combination of vogadro"s !aw and

Combined as !aw$ %he ideal gas law is approximatel' true for all gases under laborator' conditions

such as room temperature and one atmosphere pressure$ .ince the molecules of real gases move

independentl' and interact wea(l' with one another, the' behave nearl' ideall' under normal conditions$

%he e/uation of ideal gas is expressed mathematicall' as:

Pv = nRT

here: P pressure n number of moles T temperature

$ V volume R gas constant 23 0$051 ! atm 6 mol8

9efore the ideal gas was formulated, scientists wor(ed on how the volume of gases was affected

b' pressure, temperature, number of mole of gas$ &xample of which is 9o'le"s !aw, which relatesvolumes of gas to its temperature) where here it is seen that volume inversel' proportional to the pressure

and is mathematicall' expressed as:

PV = a constant or P1V1= P2V2

or a fixed volume of gas at a constant pressure, volume is directl' proportional to the

temperature in (elvins 28, it is the Charles" !aw:

xperiment no. 8

Gas Laws

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

De La Salle University

Dasmarias

8/9/2019 Gas Laws (Introduction and Abstract)

2/2

K= C +273 a constant=

V

T or

V1

T1=

V2

T2

nd a'-!ussac"s !aw for a fixed mass of gas at a constant volume, the pressure is directl' proportional

to the temperature in (elvins 28, expressed as:

aconstant=P

T r

P1

T1=P2

T2

hen 9o'le"s, Charles" and a'-!ussac"s !aws are combined the' form the Combn!" #as$a%, expressed as:

aconstant=PV

T r P1V1

T1=P2V2

T2

.imilarl', vogadro"s !aw relates the volume of gas to its number of moles$ It states that underthe same temperature and pressure, the volume of gas is directl' proportional to its number of moles,which can be expressed as:

V1n2=V2 n1

n= moles of gas 2mol8

R&'&R&NC&S

218 .amonte ;$!, igueroa !$< eneral Chemistr' !aborator' =anual 4 th&dition, C>& ?ublishing Inc$,5014$258 9ettelheim $ , 9rown $*, Campbell =$, arrell .$, Introduction to eneral, rganic and9iochemistr', @th &dition, Cengage !earning Inc$, 5010$