amount of substance

Question 1

define relative atomic mass

Answer 1

the mean mass of an atom of an element compared to 1/12th of the mean mass of an atom of the carbon-12 isotope

Question 2

define relative molecular mass

Answer 2

the mean mass of a molecule of a compound, divided by 1/12th of the mean mass of an atom of the carbon-12 isotope

Question 3

what is the term relative formula mass used for

Answer 3

ionic compunds

Question 4

define advagadros constant

Answer 4

the number of particles in a mole

Question 5

what does the mole apply to

Answer 5

electrons, atoms, molecules, ions, formulas, eqautions

Question 6

equation of moles =

Answer 6

mass/mr
OR
conc x vol

Question 7

eqaution number of particles =

Answer 7

moles x advogadros

Question 8

idea gas eqaution and its units

Answer 8

PV =nRT
P= pressure in pascals
V= volume in m^3
T= temp in K
n=moles
R= ideal gas constant

Question 9

define empirical formula

Answer 9

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

Question 10

define molecular formula

Answer 10

the actual number of atoms of each element in a compound

Question 11

relationship between empirical formula and molecular formula

Answer 11

mr of molecule / empirical mr = multiplier
multiplier x empirical formula = molecular formula

Question 12

percentage yield

Answer 12

experimental mass/ theoretical mass x 100

Question 13

percentage atom economy

Answer 13

mr of desired product / mr of reactants x 100

Question 14

advantages for society and for the industry of developing chemical process with a high atom economy

Answer 14

little or no waste product so more economically viable for industrial scale manufacture
less use of natural resources therefore less use of energy so better for environment