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24 January, 06:02

What is the mass of H2O produced when 10.0 grams of H2 reacts completely with 80.0 grams of O2?

A (70.0 grams)

B (90.0 grams)

C (180.0 grams)

C (800.0 grams)

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Answers (1)
  1. 24 January, 06:50
    0
    H₂:

    M=2g/mol

    m=10g

    n = m/M = 10g/2g/mol = 5mol

    O₂:

    M = 32g/mol

    m = 80g

    n = m/M = 80g/32g/mol = 2,5mol

    2H₂ + O₂ ⇒ 2H₂O

    2mol : 1mol : 2mol

    5mol : 2,5mol : 5mol

    10g : 80g : 10g+80g=90g

    B
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