Reacting masses

• Chemistry
• Secondary Education

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Quiz 3

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Reminders

• Prepare your device.
• Join LessonUp.com =  code: 756 535
• Prepare your calculator and Periodic Table.

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Topic 8 - The Mole and the Avogadro Constant

Calculating Reacting Masses

03 December 2025

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In this lesson, I will:

• calculate reacting masses in simple proportions. 

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Calculate the mass of sulfur that must be burned to give 64 g of sulfur dioxide.

unknown mass 

Mr of substance

given mass 

Mr of substance

=

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Calculate the mass of sulfur that must be burned to give 8 g of sulfur dioxide.

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What mass of carbon can be completely burned in 32 g of oxygen?

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What mass of iron must be heated with excess sulfur to produce 4.4 g of iron (II) sulfide?

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Which mass of magnesium oxide is formed when 21.0 g of magnesium carbonate is completely decomposed?

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 Which mass of oxygen reacts exactly with 6 g of magnesium?

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Assesses student comprehension through a worksheet, quiz, a lab report, or a concluding class discussion.

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