Introduction to Moles

What can be determined from a balanced chemical equation?

• Mole ratio of any two substances in the reaction

• Energy released in the reaction.

• Electron configuration of all elements in the reaction.

• Mechanism involved in the reaction.

Tags

NGSS.HS-PS1-7

The __________ in a balanced equation reveals the mole ratios of the substances involved.

• subscript

• coefficients

• superscript

• total number in each compound

Tags

NGSS.HS-PS1-7

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

• 10/6

• 3/4

• 4/3

• 2/3

Tags

NGSS.HS-PS1-7

In the reaction 2 H₂ + O₂ → 2 H₂O what is the mole ratio of oxygen to water

• 1/2

• 2/1

• 3/4

• 4/3

Tags

NGSS.MS-PS1-5

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 2

• 3

• 1

Tags

NGSS.MS-PS1-5

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles

• 8 moles

• 16 moles

• 2 moles

Tags

NGSS.HS-PS1-7

Where are the numbers for a mole ratio found?

• They are part of the chemical formulas for the reactants / products.

• They are given in the problem.

• They are found on the periodic table for those elements.

• They are found as coefficients in the reaction's balanced chemical equation.

Which mole ratio tells how much aluminum oxide is produced from 3 moles of aluminum?

• 3 mol Al/ 2 mol Al₂O₃

• 2 mol Al₂O₃/ 4 mol Al

• 4 mol Al/ 2 mol Al₂O₃

• 2 mol Al₂O₃/ 3 mol Al

Tags

NGSS.HS-PS1-7

What is the mole ratio of Mg to MgCl₂?

• 2 mol Mg/ 1 mol MgCl₂

• 1 mol Mg/ 2 mol MgCl₂

• 1 mol Mg/ 1 mol MgCl₂

• 2 mol Mg/ 2 mol MgCl₂

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ --> 2NH₃

How many moles of NH₃ is produced from 6 moles of N₂?

• 12 moles

• 3 moles

• 2 moles

• 1.5 moles

Tags

NGSS.HS-PS1-7