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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. How many moles are in 88 g of CO2 (molar mass 44)?

    Answer: 2.0 mol

    88 g / 44 g/mol = 2.0 mol.

  2. In N2 + 3H2 → 2NH3, how many liters of NH3 form from 6 L of H2 at constant T and P?

    Answer: 4 L

    Gas volume ratio of H2 to NH3 is 3:2, so 6 L H2 gives 4 L NH3.

  3. What is the concentration of a solution with 0.5 mol solute in 250 mL?

    Answer: 2.0 M

    Molarity is 0.5 mol / 0.250 L = 2.0 M.

  4. How many grams of H2O form when 32 g of CH4 burns completely (CH4=16, H2O=18)?

    Answer: 72 g

    32 g CH4 is 2 mol, and each yields 2 mol water, giving 4 mol × 18 = 72 g.

  5. What is the oxidation-state-independent mass of 1.5 mol of Fe2O3 (Fe=56, O=16)?

    Answer: 240 g

    Fe2O3 molar mass is 160 g/mol, so 1.5 mol weighs 240 g.

  6. How many moles of ions are produced when 1 mol of Na2SO4 fully dissolves?

    Answer: 3 mol

    Na2SO4 dissociates into 2 Na+ and 1 SO4^2-, totaling 3 mol of ions.

  7. If 25 g of a reactant reacts but only 20 g of product forms versus a 25 g theoretical yield, what limits efficiency?

    Answer: The percent yield is 80%

    Actual 20 g over theoretical 25 g gives an 80% percent yield.