Amount of Substance formulas/definitions Flashcards
1
Q
moles=
A
mass/mr
2
Q
percentage composition=
A
Ar x no. of atoms
———————– x 100
Mr of molecule
3
Q
atom economy
A
mass of desired product
———————————– x100
mass of reactants
4
Q
percentage yield
A
actual mass
———————- x100
theoretical mass
5
Q
reasons for <100% yield
A
- reaction doesn’t go to completion
- side reactions
- reversible reactions
- loss of product during transfer
- impure reactants
6
Q
ideal gas equation
A
pV=nRT
7
Q
units for p in ideal gas equation
A
Pa
8
Q
units for V in ideal gas equation
A
m3
9
Q
what is R?
A
gas constant - 8.31 JK-1mol-1
10
Q
units for T in ideal gas equation
A
K
11
Q
What is an ideal gas?
A
- particles have no volume
- no attraction/repulsion between particles
- particles are identical and in continuous random motion
- collisions are elastic
12
Q
concentration =
A
moles/volume
13
Q
Avogadro’s constant =
A
6.022 x 10^23
14
Q
what is empirical formula?
A
simplest whole number ratio of atoms of each element in a compound
15
Q
what is molecular formulas?
A
actual number of atoms of each element in a compound
16
Q
what is stoichiometry?
A
simplest whole number ratio in which chemical species react
