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General Chemistry: Stoichiometry Flashcards

7 cards from real DAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the mass of 3.01 × 10^23 atoms of carbon (C=12)?

    Answer: 6 g

    3.01 × 10^23 atoms is 0.5 mol, which weighs 0.5 × 12 = 6 g.

  2. In 2Al + 3Cl2 → 2AlCl3, how many moles of AlCl3 form from 4 mol of Al with excess Cl2?

    Answer: 4 mol

    The 2:2 ratio of Al to AlCl3 means 4 mol Al gives 4 mol AlCl3.

  3. What is the mole fraction of solute in a solution made of 2 mol solute and 8 mol solvent?

    Answer: 0.20

    Mole fraction is 2 / (2 + 8) = 0.20.

  4. How many grams of NaOH are needed to make 500 mL of a 2.0 M solution (NaOH=40)?

    Answer: 40 g

    0.5 L × 2.0 mol/L = 1.0 mol NaOH, which is 40 g.

  5. If 10 g of CaCO3 (molar mass 100) decomposes, how many moles of CaO form (1:1 ratio)?

    Answer: 0.10 mol

    10 g / 100 g/mol = 0.10 mol CaCO3, giving 0.10 mol CaO.

  6. What is the molecular formula of a compound with empirical formula CH2O and molar mass 180 g/mol?

    Answer: C6H12O6

    The empirical mass is 30, and 180/30 = 6, giving C6H12O6.

  7. How many moles of electrons are transferred when 1 mol of Al becomes Al3+?

    Answer: 3 mol

    Each Al atom loses 3 electrons to form Al3+, so 1 mol loses 3 mol of electrons.