When 2.0 g copper is heated with an excess of sulfur, copper (I) sulfide is the product. What is the mass of the copper (I) sulfide produced

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When 2.0 g copper is heated with an excess of sulfur, copper (I) sulfide is the product. What is the mass of the copper (I) sulfide produced? (mass to mass)

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Kim Chi 3 years 2021-08-25T11:02:16+00:00 1 Answers 6 views 0

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  1. thuthao
    0
    2021-08-25T11:03:43+00:00
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    Answer: Mass is 2.50 g

    Explanation: reaction 2 Cu + S ⇒ Cu2S

    Amount of Cu = m/M = 2.00 g /63.55 g/mol= 0.03147 mol

    Amount of Cu2S = 0.5 n(Cu) = 0.01574 mol

    M(Cu2S)= 159.17 g/mol, m = n·M

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )