2.1 + 2.2 atoms and reactions

Question 1

define: relative atomic mass

Answer 1

weighted average mass of an element taking into account its isotopes, relative to 1/12th the atomic mass of C-12

Question 2

define: empirical formula of a substance

Answer 2

the simplest whole number ratio of its elements

Question 3

ideal gas equation and units:

Answer 3

PV = nRT
P = pressure (pascals, Pa)
V = volume (m3)
n = number of moles of gas (mol)
R = gas constant (8.31 J K-1 mol-1)
T = temperature (kelvin, K)

Question 4

define: molecular formula

Answer 4

exact numbers of atoms of each element present in the formula of the compound

Question 5

mol =

Answer 5

g/gmol-1

Question 6

conc =

Answer 6

n/vol

Question 7

volume of gas (dm3) =

Answer 7

amount of gas (mol) x 24 dm3 mol-1

Question 8

what does a higher atom economy mean

Answer 8

less waste produced