Exam II Flashcards
Chapters 4-6
1
Q
How do you convert from mass (g) to moles to molecules?
A
(Amount (g) x 6.022x10^23) / molar mass
2
Q
How do you calculate % weight of an element in a compound?
A
(number of molecules of z x molar mass of z) / total molar mass of one molecule.
3
Q
How do you find the weight of an molecule in grams given the percent composition?
A
Actual weight = (% mass x total mass) /100
4
Q
What compound has fewer than 8 electrons due to shortage?
A
BeH2
5
Q
What compound has fewer than 8 electrons due to an odd number?
A
NO2
6
Q
What compound has an expanded octet?
A
SF6
7
Q
What does VSEPR stand for?
A
Valence Shell Electron Pair Repulsion
8
Q
What type of geometry includes lone pairs?
A
Electron geometry
