Chemical Arithmetics — Practice Quiz
Telangana Open School (TOSS) · Class 12 · Chemistry
Try a 4-question quiz on Chemical Arithmetics for Telangana Open School (TOSS) Class 12 Chemistry: tap an answer to check it and see why.
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Quick Quiz: Chemical Arithmetics
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What is the empirical formula of glucose (C₆H₁₂O₆)?
Which of the following represents the molecular formula of water?
What is the percentage of oxygen in CO₂? (Atomic masses: C = 12, O = 16)
Which of the following is an ionic compound and thus has only an empirical formula?
Sample Questions
The mole ratio of Fe to O in Fe₂O₃ is:
Show answer
2:3
Fe₂O₃ contains 2 Fe atoms and 3 O atoms, so mole ratio is 2:3.
What is the molar mass of O₂? (Atomic mass of O = 16)
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32 g/mol
O₂ is a diatomic molecule. Molar mass = 2 × 16 = 32 g/mol.
How many moles are present in 18 g of water? (H₂O = 18 g/mol)
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1 mol
Number of moles = mass / molar mass = 18 g / 18 g/mol = 1 mol.
Which of the following substances has the same empirical and molecular formula?
Show answer
NH₃
NH₃ cannot be simplified further, so its empirical and molecular formulas are the same.
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