Amount Of Substance

Question 0

Relative molecular mass (Mr) - of a molecule

Answer 0

Is the mass of a molecule compared to 1/12th the relative atomic mass of an atom of carbon-12

Question 1

Relative atomic mass (Ar)

Answer 1

Weighted average mass of an atom of an element, taking into account it’s naturally occurring isotopes, relative to 1/12th the mass of a carbon-12 atom

Question 2

The mole

Answer 2

The amount of substance that contains the same num of elementary particles as there are atoms in 12 g of carbon - 12

Question 3

Avogadro’s constant

Answer 3

Number of particles In 1 mole of any substance (6.023 x 10(23) mol-1)

Question 4

Molar mass

Answer 4

The mass in grams of one mole of a substance

Question 5

Pv=nRT

Answer 5

P-pa
V- m3
N- mol
R- gas constant 
T- temperature

Question 6

Empirical formula

Answer 6

Simplest whole number ratio of the atoms of each element in a compound

Question 7

Molecular formula

Answer 7

Actual number of atoms of each element present In a compound (determined by empirical formula )