Chemical Arithmetics — Important Questions
Telangana Open School (TOSS) · Class 12 · Chemistry
53 important questions from Chemical Arithmetics for Telangana Open School (TOSS) Class 12 Chemistry, with answers. Written for the board exams 2027.
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Important Questions from Chemical Arithmetics
The mole ratio of Fe to O in Fe₂O₃ is:
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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?
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NH₃
NH₃ cannot be simplified further, so its empirical and molecular formulas are the same.
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