DF - Formulae, equations and amount of substance *01

Question 1

Ideal Gas Equation

Answer 1

PV=nRT

Pressure = Pa (kPa --> Pa x10000
Volume = m3 (m3 --> cm3 x10^5)
n = moles 
R = gas constant (8.31JK-1mol-1)
Temperature = kelvin ( +273 )

Question 2

Molar volume

Answer 2

all gases take up the same volume at RTP (298K, 100kPa)

this volume is 24dm^3

Question 3

how do you work out the no. of moles of gas in a certain volume?

Answer 3

no. of moles = vol. (dm^3) / 24

Question 4

how would you work out no. of molecules of gas?

Answer 4

1. find the no. of moles (vol. in dm^3 / 24)

2. x no. of moles by avogadro’s constant (6.02 x 10^23)

Question 5

Techniques and procedures to measure vol. of gases

Answer 5

use a gas syringe

1. attach to opening of reaction vessel lets you measure how much gas is produced
2. will show total vol. of gases
3. can tell when a reaction has ended as no further change in gas vol.

Question 6

PAG 1