M2-C3-Amount of substance

Question 1

avogadros constant

Answer 1

number of particles in each mole of carbon-12

Question 2

empirical formula

Answer 2

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

Question 3

molecular formula

Answer 3

the actual number and type of atoms of each element in a molecule

Question 4

water of crystalisation

Answer 4

water molecules found within the crystalline structure of the hydrated salt

Question 5

anhydrous

Answer 5

doesn’t contain water molecules

Question 6

eg where the method of heating water of crystallisation off an anhydrous salt isn’t suitable

Answer 6

if the anhydrous salt decomposes on heating

Question 7

1 mole of any gas at room temp volume

Answer 7

24dm3

Question 8

assumptions of Pv=nRt

Answer 8

1) Random motion
2) Elastic collisions
3) negligible size (compared to the container)
4) no intermolecular forces

Question 9

atom economy

Answer 9

a measure of how much products are useful

Atom economy =
Mr desired product / Mr all products

Question 10

advantage of high atom economy

Answer 10

• reduces production of unwanted products

- makes process more sustainable

Question 11

% yield

Answer 11

= amount of product you actually make

/ amount of product you should theoretically make

Question 12

do what you oughter…..

and why

Answer 12

add acid to the water

• water=high SCH
• water absorbs heat