5 - Formulae, Amounts Of Substance Flashcards
1
Q
What’s avogadros constant?
A
6.02 x 10^23
2
Q
What is the R constant
A
8.314
3
Q
What is the ideal gas equation?
A
PV = nRT
4
Q
Calculating moles?
A
mass / rfm (molar mass)
5
Q
Moles/ rfm/ mass triangle?
A
mass on top! moles and rfm on bottom
6
Q
Unit for pressure?
A
Pascals (pa) 1kpa = 1000pa
7
Q
Unit for volume?
A
m^3
8
Q
Converting from degrees centigrade to Kelvin?
A
+ 273
9
Q
Using empirical formula?
A
divide the mass by the rfm for all given elements
if the ratio is clear then leave it
if not divide by the smallest
work out the ratio
10
Q
Ionic equations?
A
break down all elements into their ions
cancel out ions either side of the equation
rewrite with what’s left
11
Q
Gas triangle?
A
volume on top, moles and 24 on bottom
12
Q
Volume of most gases at r.t.p
A
24
