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Stoichiometry

AP Chemistry· difficulty 3/5

A reaction Mg + 2 HCl → MgCl₂ + H₂ is run with 24.3 g Mg and excess HCl. The student collects 0.85 g H₂.

m_Mg = 24.3 g (1.00 mol) Theoretical H₂: 1.00 mol = 2.02 g Actual H₂: 0.85 g Find % yield

What is the percent yield?

  • A

    85%

  • B

    100%

  • C

    42%

    check_circle
  • D

    50%

Explanation

% yield = (actual/theoretical)·100 = (0.85/2.02)·100 = 42.1%.

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