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Moles GramsChemical Reactions

AMU’sMolecules & Atoms

How many moles of carbon atoms do you have?

You have four moles of CO2

4 moles of carbon

You have four moles of CO2

How many moles of oxygen atoms do you have?

You have four moles of CO2

8 moles of oxygen

You have four moles of CO2

How many grams of carbon do you have?

You have four moles of CO2

48 grams of carbon

You have four moles of CO2

How many atoms of carbon do you have?

You have four moles of CO2

2.4 x 1024 carbon atoms

You have four moles of CO2

How many oxygen atoms do you have?

You have four moles of CO2

4.8 x 1024 oxygen atoms

You have four moles of CO2

You have 51 grams of Al2O3

How many moles of aluminum oxide do you

have?

0.5 moles Al2O3

You have 51 grams of Al2O3

How many grams of aluminum do you have?

You have 51 grams of Al2O3

27 grams of aluminum

You have 51 grams of Al2O3

How many grams of oxygen do you have?

You have 51 grams of Al2O3

24 grams of oxygen

You have 51 grams of Al2O3

How many molecules of aluminum oxide do you

have?

You have 51 grams of Al2O3

3.01 x 1023 molecules of aluminum oxide

You have 51 grams of Al2O3

How many oxygen atoms do you have?

You have 51 grams of Al2O3

9.03 x 1023 oxygen atoms

You have 51 grams of Al2O3

2 Na(s) + Cl2(g) → 2 NaCl(s)

If you have 23 g of sodium, how many grams of

chlorine gas do you need?

35.5 g Cl

2 Na(s) + Cl2(g) → 2 NaCl(s)

111.7 grams of iron reacts completely with oxygen in

the air, turning to powdery red rust. What is the mass

of the rust?

4 Fe + 3 O2 → 2 Fe2O3

159.7 g of iron oxide

4 Fe + 3 O2 → 2 Fe2O3

100 g of water is electrolyzed to release hydrogen and

oxygen as gasses. Afterwards, 10 g of water remain. What is

the mass of hydrogen gas produced?

2 H2O → 2 H2 + O2

10 g H2

2 H2O → 2 H2 + O2

1.0 L of 1.0 M HCl will be neutralized by how much

0.1 M NaOH?

HCl + NaOH → NaCl + H2O

10.0 L 0.1 M NaOH

HCl + NaOH → NaCl + H2O

What mass of sodium hydroxide is needed to neutralize 1.0 moles of

sulfuric acid?

H2SO4 + NaOH → Na2SO4 + H2O

80 g NaOH

H2SO4 + NaOH → Na2SO4 + H2O

What is the molecular mass of water?

H2O

18 AMU

H2O

An unknown element is found to have 113 protons,

113 electrons, and 175 neutrons. What is its

atomic mass?

288 AMU’s

Arsenic has an atomic number of 33 and an

atomic mass of 75. How many neutrons are in an

atom of arsenic?

As

42 neutrons

As

73 g of magnesium burns completely in air. What is the mass of the resulting

magnesium oxide?

121 g MgO

How many AMU are in a gram?

6.02 x 1023 AMU = 1 gram

What is the mass in grams of 1.8 x 1024 molecules of

sulfur dioxide?

SO2

192 g

SO2

Phosphoric acid is a strong acid. When 98 g are

dissolved in water, how many hydrogen atoms are

released into solution?

1.8 x 1024 atoms

A hydrocarbon has the formula

CH3(CH2)nCH3It is found to have a molecular

mass of 3320 AMU. How long is the molecule,

measured in carbon atoms?

237 carbon atoms

Two monosaccharides with the formula C6H12O6 join together by dehydration

synthesis, releasing a water molecule in the process. What

is the molecular mass of the resulting disaccharide?

162 AMU

Hands-on question:

Measure out a million billion billion molecules of water.

29.9 mL