Chapter 3: Stoichiometry and the combustion of fuels

Question 1

Gas Constant

Answer 1

The constant, R, in the Universal Gas equation PV=nRT. R= 8.31 JK^-1 mol^-1 where pressure is measured in kPA, volume in L and temperature in K.

Question 2

Ideal Gas

Answer 2

A gas which obeys the Universal Gas equation at all temperatures and pressures.

Question 3

Kelvin Scale

Answer 3

The absolute temperature scale. Deg K = C +273.

Question 4

Pascal

Answer 4

Unit of pressure equal to 1 newton per square metre where pressure = force over area.

Question 5

Pressure

Answer 5

The force exerted per unit area of a surface.

Question 6

Standard Atmosphere

Answer 6

One standard atmosphere (1 atm) is the pressure required to support 760 mm of mercury (760mm Hg) in a mercury barometer at 25 deg C. One atmosphere pressure is approximately the pressure experienced at sea level.

Question 7

Standard conditions

Answer 7

Standard reference conditions to compare testing of experimental activities. Conditions at which:

• Gas pressure is 100 kPa or 1 bar, the temperature is 25 deg C (298K) and the concentration of any dissolved species is 1.0M.

Question 8

Standard Laboratory Conditions (SLC)

Answer 8

Conditions at which gas pressure is 100 kPA (1 bar) temperature is 0deg C (273 K). One mole of an ideal gas at SLC has a volume of 24.8 L.

Question 9

Standard Temperature and Pressure (STP)

Answer 9

Conditions at which gas pressure is 100 kPA (1 bar) temperature is 0 deg C (273 K). One mole of an ideal gas at STP has a volume of 22.7.

Question 10

Universal Gas Equation

Answer 10

PV=nRT which is the equation which describes the behaviour of an ideal gas.

Question 11

Bar

Answer 11

A unit of pressure. 1 bar 100kPa.