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7 April, 15:01

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%?

how many grams of zinc are needed to produce 112 l of H2 at STP?

a. 95 g

b. 180

c. 280

d. 380

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Answers (1)
  1. 7 April, 15:12
    0
    Reaction equation:

    Zn + 2HCl → ZnCl₂ + H₂

    One mole of gas occupies 22.4 L at STP

    Moles of H₂ = 112/22.4

    = 5 moles

    The theoretical amount of Zn needed is 5 mol

    The actual amount = 5/0.85

    = 5.88 moles

    mass = moles x Mr

    mass = 5.88 x 65

    mass = 382.2 g

    The answer is D.
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