amount of substance Flashcards
1
Q
molar gas volume
A
volume of 1 mole of gas at a given temperature and pressure
2
Q
gases at RTP
A
at room pressure (1atm) and 25C , the molar gas volume is 24dm3 mol-1
3
Q
avagadros constant
A
6.02x10^23 in 12 grams of carbon-12
4
Q
moles equations
A
moles = gram/RAM moles = conc x vol /1000
5
Q
1000mg
A
1 gram
6
Q
1000g
A
1kg
7
Q
10000kg
A
1 tonne
8
Q
kPa > Pa
A
x1000
9
Q
dm3 → m3
A
divide by 1000
10
Q
cm3 → m3
A
divide by 1,000,000
11
Q
C to Kelvin
A
add 273
12
Q
empirical formulae
A
- divide by Ar
- divide by smallest amount
- multiply if needbe to make whole number
13
Q
hydrated salt contains
A
water of crystallisation
14
Q
heating in a crucible method
A
- weigh an empty clean dry crucible and lid
- add 2g of hydrated calcium sulfate to the crucible and weigh again
- heat strongly with a bunsen for a couple of minutes
- allow to cool
- weigh the crucible and contents again
- heat crucible again and reweigh until you reach a constant mass
15
Q
concentration
A
amount/volume
