Stoichiometry Review

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2

• 4

• 6

• 8

Tags

NGSS.HS-PS1-7

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg/ 3 mol Fe

• 1 mol Fe/ 2 mol Fe

• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol of O₂

• 1.0 mol of O₂

• 10.1 mol of O₂

• 4.5 mol of O₂

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g of H₂

• 2.6 g of H₂

• 690 g of H₂

• 45 g of H₂

Tags

NGSS.HS-PS1-7

In the chemical equation below, Na is the symbol for sodium

• 4

• How many hydrogen atoms are on the left side?

• 2

• How many sodium atoms are on the left side

• 2

• How many hydrogen atoms are on the right side?

• 4

• How many sodium atoms are on the left side?

Tags

NGSS.HS-PS1-7

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield

• mole ratio

• actual yield

• percentage yield

What mass of AgBr is formed when 35.5 mL of 0.184 M AgNO₃ is treated with an excess (extra) of aqueous hydrobromic acid?

• 53.6 g of AgBr

• 1.44 g of AgBr

• 1.23 g of AgBr

• 34.5 g of AgBr

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

• Write a Balanced Equation

• Panic

• Write an Unbalanced Equation

• Ask for help

True or False. You must convert grams to moles to do stoichiometry.

• True

• False

What is the measured amount of a product obtained from a chemical reaction?

• mole ratio

• theoretical yield

• percentage yield

• actual yield