Mole concept in gases

Question 1

Ideal gas equation ( 3rd way to find no. of moles)

Answer 1

PV = nRT
P = pressure
V = volume
n = no. of moles
R = Universal gas constant
T = Temperature

Question 2

Kelvin

Answer 2

C + 273.15

Question 3

1 atm

Answer 3

1.01325 x 10^5 Pa

Question 4

1 bar

Answer 4

10^5 Pa

Question 5

STP

Answer 5

Standard Temperature Pressure

Question 6

NTP

Answer 6

Normal Temperature pressure

Question 7

At STP

Answer 7

T = 273 K ; P = 1 bar ; V = 22.7 L

Question 8

At NTP

Answer 8

T = 273 K ; P = 1 atm ; V => 1(V) = 1 ( 0.0821) ( 273) = 22.4 L ( PV = nRT where no. of moles (n) = 1)

Question 9

Formula to calculate no. of moles at STP (4th way)

Answer 9

V ( in litres) / 22.7 L

Question 10

Formula to calculate no. of moles at NTP(5th way)

Answer 10

V ( in litres ) / 22.4 L

Question 11

Conditions to be satisfied to apply formula 4th & 5th

Answer 11

1. finding no. of moles of gas
2. STP/NTP

Question 12

For calculation purpose

Answer 12

NTP = STP (Approx ) as 1 atm = 1 bar ( approx) => volume occupied taken as 22.4 L for both

Question 13

R ( if in J )

Answer 13

8.314 J/K/mol

Question 14

R ( if in atm)

Answer 14

0.0821 L atm / K / mol

Question 15

R( if in bar )

Answer 15

0.08314 L bar/K/mol

Question 16

R ( if in cal )

Answer 16

2 cal / K / mol ( 1 cal = 4.2 J)