Laws

Question 1

Boyles Law

Answer 1

At constant temp., the volume occupied by a fixed amount of gas is inversely proportional to the applied (external) pressure.

PV= a constant

Pv1 Vv1 = Pv2 Vv2

Question 2

Charles’s Law

Answer 2

At constant pressure, the volume occupied by a fixed amount of gas is directly proportional to its absolute temp.

V= constant x T

Vv1/Tv1 = Vv2/Tv2

Question 3

Avogadro’s Law

Answer 3

The volume of a gas at constant temp. and pressure is directly proportional to the number of moles of the gas

V = constant x n

n= # of moles of the gas

Vv1/nv1 = Vv2/nv2

Question 4

Ideal-Gas Law

Answer 4

combined laws, gas that exhibits linear relationships among V, P, T, and n.

V= RnT/P
PV=nRT
R= 0.0821 atm•L/mol•K

Question 5

Dalton’s Law

Answer 5

The total pressure of a mixture of gases equals the sum of the pressures that each would exert if it were present alone.

Pvtotal= Pv1 + Pv2 + Pv3 +…
Pv1= (nv1/nv2)Pvt= Xv1Pvt

Question 6

Density of Gases

Answer 6

D=m/v
D=MP/RT M=molecular weight
PV=nRT

Question 7

The Molar Mass of a Gas

Answer 7

M=mRT/PV
R=0.0821 atm•L/mol•K

Question 8

Graham’s Law

Answer 8

The rate of effusion of a gas is inversely proportional to the square root of its molar mass

Rate of effusion= amount of gas effused/unit time
r= n/t
rv1/rv2 = square root of Mv2/Mv1

Question 9

Gay-Lussacs Law

Answer 9

Pv1Tv2=Pv2Tv1