AMOUNT OF SUBSTANCE

Question 1

What is Avogadro’s constant?

Answer 1

6.022 x 10^23. This is also the amount of atoms in 1 mol of a given substance

Question 2

What is the formua triangle for solids?

Answer 2

Mass
___________

Mr | Mol

Mass is in grams, Mr and mol have no units

Question 3

What is the formula triangle for solutions?

Answer 3

Mol
____________
Conc | Vol/1000

Mol has no units
Concentration is in mol dm^-3
Volume is in cm^3, and divided by 1000 is the equivalent value in decimetres

Question 4

What is the formula triangle for gases?

Answer 4

Vol
___________
Mol | Mv

Volume is in cm^3 or dm^3, depending on the Mv used
Mol has no units
Mv is either 24000cm^3 or 24 dm^3

Question 5

What is the ideal gas equation?

Answer 5

pV = nRT
P is pressure, measured in (Pa)scal
V is volume, measured in m^3
n is the number of moles of gas
R is the ideal gas constant - 8.314 J mol^-1 K^-1
T is temperature, measured in Kelvin (celsius + 273)