Moles and Stoichiometry

2 C₈H₁₈ + 25 O₂ → 18 H₂O + 16 CO₂

How many moles of water would be produced by burning (reacting) 8.15 moles of octance, C₈H₁₈, with oxygen from the air?

• 73.4 moles

• 16.3 moles

• 147 moles

• 18.0 moles

CaCl₂ + 2Na --> 2NaCl + Ca With 2.2 moles of CaCl2, how much Ca can be produced? and how much NaCl can be produced?

• 8 Ca and .2 NaCl

• 4.8 Ca and NaCl

• 2.2 Ca and 4.4 NaCl

• 2 Ca and 9 NaCl

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

• 4 mol H₂O

• 6.032 mol H₂O

• 12.375mol H₂

• 96 mol H₂O

Tags

NGSS.HS-PS1-7

Mg + Fe₂O₃ → MgO + Fe; What is the Ratio

• 3:1:3:2

• 3:1:3:1

• 1:5:3:2

• 3:1:1:2

What is the molar mass of NaOH?

• 368 g/mole

• 40 g/mole

• 57 g/mole

Tags

NGSS.HS-PS1-7

What is the first thing you must do to solve a stoichiometry problem?

• Ratio

• write down all substances

• add all together

• adjust the mole amounts

How many moles of S₈ is needed to produce 12 moles of SO₃?

• 1

• 1.5

• 2

• 12

Tags

NGSS.HS-PS1-7

How many moles of KCl is produced when 6.75 moles of O₂ is also produced?

• 2

• 3.5

• 4.5

• 6.75

Tags

NGSS.HS-PS1-7

An excess reactant is

• the substance that runs out first

• the product that is easier to measure

• the reactant that has "extra"

• the product that is also in the reactant

dough + 2 cups cheese + 1 cup sauce + 8 pineapples--> 1 pizza

At the store I buy a pack of 2 doughs and a bag with 6 cups of cheese: what is my limiting reactant in making my pizza?

• The sauce

• the cheese

• The dough

• The pineapples

Tags

NGSS.MS-PS1-5