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27 June, 16:14

2.

Given the following reaction2Na2S2O3 + AgBr

NaBr + Naz[Ag (S203) 2]

a. How many moles of Na2S2O3 are needed to react completely with 42.7 g of AgBr?

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Answers (1)
  1. 27 June, 16:35
    0
    0.454moles

    Explanation:

    Calculate the molar mass of AgBr

    Ag=108

    Br=80

    Molar mass = 108+80

    Molar mass=188g/mol

    It's mole to gram question

    2moles of Na2S2O3 = 188g of AgBr

    X moles of Na2S2O3=42.7g of AgBr

    Cross multiply

    188x=2*42.7

    X = 85.4/188

    X=0.454moles
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