amount of substance

Question 1

what equation links mass, Mr and mol

Answer 1

mass= Mr x mol

Question 2

what is the definition of relative atomic mass?

Answer 2

an average mass of one atom of an element compared to one twelfth of the mass of an atom of carbon 12

Question 3

how to calculate % yield

Answer 3

% yield= (actual mass)(mol of products) / (theoretical mass) (mole of reactants) x 100

Question 4

how to calculate % atom economy

Answer 4

useful (Mr) / total products (Mr) x100

Question 5

how to calculate % uncertainty

Answer 5

(no of readings) x apparatus bound / amount measured x 100

Question 6

how to calculate total uncertainty

Answer 6

sum of all % uncertainites

Question 7

how to calculate % error

Answer 7

(measured) (true) - (actual) (expected) / (actual) (expected)

Question 8

what is the equation that links with conc, mol and vol

Answer 8

conc= mol/vol

Question 9

what is the equation that links pressure, volume, mol, gas constant and temperature

Answer 9

Pv= nRT