Practice Mole Concept (5.1) - Mole Concept and Stoichiometry

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6 sample questions

Question 1.
What is one mole of any substance equal to?
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Think of a specific constant in chemistry.
Question 2.
Define molar mass.
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It connects mass with moles.
3Question 3.
What is Avogadro’s number?
- 6.022 x 10²²
- 6.022 x 10²³
- 6.022 x 10²⁴
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This is a key constant in chemistry.
4Question 4.
True or False: One mole of any gas occupies 22.4 liters at STP.
- True
- False
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Think about gas volumes at STP.
Question 5.
If 50 grams of magnesium (Mg) are needed to react completely with 80 grams of oxygen (O₂), determine the limiting reactant based on their molar masses (Mg = 24.3 g/mol, O₂ = 32 g/mol).
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Check the stoichiometric ratios and relate them to the moles calculated.
Question 6.
Calculate the mass needed to produce 5 moles of water (H₂O) given the molar mass of water is 18 g/mol.
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Use the molar mass relationship to find the required mass.

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