Practice The Mole Concept And Avogadro’s Constant (1.1) - Unit 1: Stoichiometric Relationships

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6 sample questions

Question 1.
Calculate the number of moles in 10 grams of sodium (Na).
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Use the formula number of moles = mass (g) / molar mass (g/mol).
Question 2.
How many molecules are in 0.25 moles of water (H₂O)?
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Remember to multiply moles by Avogadro's number.
3Question 3.
What is Avogadro's number?
- 6.022 × 10²²
- 6.022 × 10²³
- 6.022 × 10²⁴
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Think about how we quantify moles in chemistry.
4Question 4.
True or False: The molar mass of a substance is the same as its atomic mass.
- True
- False
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Consider the units used for each measurement.
Question 5.
If you have 500 grams of iron (Fe), how many moles is that?
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Refer to the relationship between mass and moles.
Question 6.
A chemical reaction produces 3 moles of gas when 6 grams of hydrogen (H₂) reacts. What is the percent yield if the theoretical yield is 5 moles?
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Use the formula for percent yield.

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