MolesGrams Chemical Reactions AMU’s Molecules & Atoms

How many moles of carbon atoms do you have? You have four moles of CO 2

4 moles of carbon You have four moles of CO 2

How many moles of oxygen atoms do you have? You have four moles of CO 2

8 moles of oxygen You have four moles of CO 2

How many grams of carbon do you have? You have four moles of CO 2

48 grams of carbon You have four moles of CO 2

How many atoms of carbon do you have? You have four moles of CO 2

2.4 x carbon atoms You have four moles of CO 2

How many oxygen atoms do you have? You have four moles of CO 2

4.8 x oxygen atoms You have four moles of CO 2

You have 51 grams of Al 2 O 3 How many moles of aluminum oxide do you have?

0.5 moles Al 2 O 3 You have 51 grams of Al 2 O 3

How many grams of aluminum do you have? You have 51 grams of Al 2 O 3

27 grams of aluminum You have 51 grams of Al 2 O 3

How many grams of oxygen do you have? You have 51 grams of Al 2 O 3

24 grams of oxygen You have 51 grams of Al 2 O 3

How many molecules of aluminum oxide do you have? You have 51 grams of Al 2 O 3

3.01 x molecules of aluminum oxide You have 51 grams of Al 2 O 3

How many oxygen atoms do you have? You have 51 grams of Al 2 O 3

9.03 x oxygen atoms You have 51 grams of Al 2 O 3

2 Na(s) + Cl 2 (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) + Cl 2 (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 O 2 → 2 Fe 2 O 3

159.7 g of iron oxide 4 Fe + 3 O 2 → 2 Fe 2 O 3

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 H 2 O → 2 H 2 + O 2

10 g H 2 2 H 2 O → 2 H 2 + O 2

1.0 L of 1.0 M HCl will be neutralized by how much 0.1 M NaOH? HCl + NaOH → NaCl + H 2 O

10.0 L 0.1 M NaOH HCl + NaOH → NaCl + H 2 O

What mass of sodium hydroxide is needed to neutralize 1.0 moles of sulfuric acid? H 2 SO 4 + NaOH → Na 2 SO 4 + H 2 O

80 g NaOH H 2 SO 4 + NaOH → Na 2 SO 4 + H 2 O

What is the molecular mass of water? H2OH2O

18 AMU H2OH2O

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 AMU = 1 gram

What is the mass in grams of 1.8 x molecules of sulfur dioxide? SO 2

192 g SO 2

Phosphoric acid is a strong acid. When 98 g are dissolved in water, how many hydrogen atoms are released into solution?

1.8 x atoms

A hydrocarbon has the formula CH 3 (CH 2 ) n CH 3 It 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 C 6 H 12 O 6 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