Amount of substance

Question 1

Define relative molecular mass

Answer 1

Average mass of the naturally occurring isotopes of a compound, compared to 1/12 mass of an atom of carbon12

Question 2

Define relative atomic mass

Answer 2

Average mass of the naturally occurring isotopes of an atom, compared to 1/12 mass of an atom of carbon12

Question 3

Define Avogadro constant

Answer 3

Number of particles/atoms/ions in one mole of a substance

Question 4

Write the mole equation

Answer 4

n= m/Mr

Question 5

Define percentage yield

Answer 5

The % of a product produced by a reaction, compared to a theoretical maximum

Question 6

How do you calculate percentage yield

Answer 6

Mass of useful products / theoretical mass of products

Question 7

What can % yield be used to investigate

Answer 7

Efficiency is a practical technique

Question 8

Define atom economy

Answer 8

% of amount of reactants made into the desired product

Question 9

How do you calculate atom economy

Answer 9

Mr of atoms of useful product /

Mr of atoms of all products

Question 10

Ideal gas equation

Answer 10

PV=nRT

Pa. m3. K. R=8.31

Question 11

How do you convert between k and C

Answer 11

C to k +273

K to C -273

Question 12

Define empirical formula

Answer 12

Simplest whole number ratio of atoms in compound

Question 13

Concentration equation

Answer 13

C = n / V