Introduction to Stoichiometry

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

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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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2 KClO₃ → 2 KCl + 3 O₂

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 1.0 mol

• 10.1 mol

• 4.5 mol

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Cl₂ + 2KBr → Br₂ + 2KCl

How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g

• 223 g

• 479 g

• 814 g

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂

How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

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The first step in stoichiometry is to

• Determine a balanced equation

• convert grams to moles

• convert grams to liters

• use the mole ratio

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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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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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