Lesson 2 Molar Quantities Read pages: 55-57 HW – More Mole Problems – Yuk.
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Transcript of Lesson 2 Molar Quantities Read pages: 55-57 HW – More Mole Problems – Yuk.
Lesson 2 Molar Quantities
• Read pages: 55-57• HW – More Mole Problems –
Yuk
Molar mass answer key
Question 1 Question 3a)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 2a)C2H6 = 30.08 g/mol
b)PCl3 = 137.32 g/mol
c) C3H7OH = 60.11 g/mol
d)N2O5 = 108.02 g/mol
Moles YukQuestion 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 HQuestion 2a)3 mol Ca; 2 mol P; 8 mol Ob)1.81 x 1024 Ca atom; 1.21x1024 P atom;
4.82x1024 O atomc) 0.00967 mol Ca; 0.00645 mol P; .0258 mol Od) 5.82 x 1021 atoms Ca; 3.88 x 1021 atoms P;
1.55x1022O atom
Moles YukQuestion 3 : calcium phosphate
Question 4a)0.0139 g N2
b) 0.0841 g N2
c) 4.20 x 103 gd) 4.65 x 10-23 g
Question 5a)176.14 g/molb) .003 molc) 2x1021 molecules
Moles Yuk
Question 6 Question 7a) 2 x 10-22 mol a) 294.34 g/molb) 5.549 mol b) 0.0339 molc) 8 x 10-22 mol c) 458 gd) 8.953 mol d) 1.1 x 1019
moleculese) 2.5 x 10-22 mol e) 4.9 x 1021 N atoms
f) 4.89 x 10-22 g
Counting Particles
Question 1 Question 38.79 x 1023 atoms a) 5.07 x 1024 atomsQuestion 2 b) 4.06 x 1026 protonsa)0.110 mol Cr c) 6.09 x 1026 neutronsb)6.65 x 1022 atomsd) 0.0498 molesc) 1.59 x 1024 protons
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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