Introduction to Stoichiometry: Moles (Chapter 10)

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

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NGSS.HS-PS1-7

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron can be made from 6 moles H₂?

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

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NGSS.HS-PS1-2

NGSS.HS-PS1-7

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂

• 576 g of O₂

• 288 g O₂

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NGSS.HS-PS1-7

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.

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NGSS.HS-PS1-7

The first step in stoichiometry is to

• Determine a balanced equation

• convert grams to moles

• convert grams to liters

• use the mole ratio

What is stoichiometry?

• The study of how the quantities of reactants and products are related in chemical reactions

• The study of the speed of reactions

• The study of how chemical reactions occur

• The study of types of reactions

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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

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NGSS.HS-PS1-7

What is the molar mass of Mg(NO₃)₂

• 148.313g/mol

• 134.306g/mol

• 54.311g/mol

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

Balance the following reaction :

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

• 1,2,2,2

• 1,2,1,1

• 2,1,1,1

• 2,1,2,1