Transcript Lesson 2 - Molar Quantities

Lesson 2 Molar Quantities
• Read pages: 55-57
• HW – More Mole Problems – Yuk
Molar mass answer key
Question 1
Question 3
a) Na = 22.99g/mol
a) Sr(CN)2 = 139.66g/mol
b) Se = 78.96 g/mol
b) NaHCO3 = 84.01 g/mol
c) Pb = 207.2 g/mol
c) Al2(SO3)3 = 294.17 g/mol
Question 2
a) C2H6 = 30.08 g/mol
b) PCl3 = 137.32 g/mol
c) C3H7OH = 60.11 g/mol
d) N2O5 = 108.02 g/mol
Moles Yuk
Question 1
a) 2 mol N; 4 mol H
b) 1.20 x 1024 N atom; 2.41x1024 H atom
c) 0.063 mol N; 0.120 mol H
d) 3.8 x 1022 atoms N; 7.5 x 1022 atoms H
Question 2
a) 3 mol Ca; 2 mol P; 8 mol O
b) 1.81 x 1024 Ca atom; 1.21x1024 P atom;
4.82x1024 O atom
c) 0.00967 mol Ca; 0.00645 mol P; .0258 mol O
d) 5.82 x 1021 atoms Ca; 3.88 x 1021 atoms P;
1.55x1022O atom
Moles Yuk
Question 3 : calcium phosphate
Question 4
a) 0.0139 g N2
b) 0.0841 g N2
c) 4.20 x 103 g
d) 4.65 x 10-23 g
Question 5
a) 176.14 g/mol
b) .003 mol
c) 2x1021 molecules
Moles Yuk
Question 6
a) 2 x 10-22 mol
b) 5.549 mol
c) 8 x 10-22 mol
d) 8.953 mol
e) 2.5 x 10-22 mol
Question 7
a) 294.34 g/mol
b) 0.0339 mol
c) 458 g
d) 1.1 x 1019 molecules
e) 4.9 x 1021 N atoms
f) 4.89 x 10-22 g
Counting Particles
Question 1
8.79 x 1023 atoms
Question 2
a) 0.110 mol Cr
b) 6.65 x 1022 atoms
c) 1.59 x 1024 protons
Question 3
a) 5.07 x 1024 atoms
b) 4.06 x 1026 protons
c) 6.09 x 1026 neutrons
d) 0.0498 moles
Molar quantities
Mole Quantities
• 1 molecule of CH4
corresponds to:
• 1 Carbon atom, 4 hydrogen
atoms
• 12 molecules of CH4
corresponds to
• 12 carbon atoms, 48 H atoms
Mole quantities
• 1 dozen CH4 molecules corresponds to
• 1 dozen C atoms, 4 dozen H atoms
• 6.02x 1023 molecules of CH4
correspond to
• 6.02x1023 C atoms and 4(6.02X1023)
H atoms
Mole quantities
• 1 Mole of CH4 molecules
corresponds to
• 1 mole of C atoms and 4 moles of
H atoms
Molecular Mass
• How many moles of
magnesium are
3.01x1023atoms of
magnesium?
Mole to Mass conversion
• How many grams are in 7.20
moles of dinitrogen trioxide?
Mole to mass conversion
• Find the number of moles in
92.2 grams of iron(III)
oxide?
Volume of a gas
• At STP 1 mole of any gas occupies
22.4 liters = molar volume of a gas
• 22.4 liters of any gas contains
6.02x1023 representative particles of
that gas
• Volume will change with temp. and
pressure
• STP = standard temperature and
pressure
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