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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