Topic 3: Amount of substance

Question 1

What is the relative atomic mass

Answer 1

Average mass of one atom of an element relative to 1/12 the mass of carbon

Question 2

Relative molecular mass

Answer 2

Average mass of one molecule /
1/12 x mass of one atom of C 12

Question 3

Mass of an atom equation

Answer 3

Mass of 1 atom= mass of 1 mole/ avagadro constant

Question 4

Concerntration equation

Answer 4

n=CV

Question 5

Ideal gas equation

Answer 5

PV=nRT

Question 6

Mole fraction equation

Answer 6

mole fraction= number of moles of gas/ total moles of gas

Question 7

Partial pressure equation

Answer 7

Partial pressure= Mole fraction * total pressure

Question 8

Empirical formula definition

Answer 8

The simplest whole number ratio of atoms of each element in a compound

Question 9

Atom economy equation

Answer 9

%Atom economy= (mr of desired product/ total mr of all reactants) *100

Question 10

Percentage yeild equation

Answer 10

Percentage yeild= (actual mass produced/ theoretical maximum mass) *100

Question 11

Advantages of higher atom economy

Answer 11

Produces less waste- less environmentally damaging
Are more cost effective- Save governments and companies money
Use fewer natural resources

Question 12

How to increase atom economy

Answer 12

Find a use for other products
Find a reaction that is reversible- so it can be continuous
Find a reactant that produces more product