wholesales stores which sell jewelry (2012? Puning City) Merchants cheated consumers with fake gold to make jewelry with fake gold. The color of fake gold and gold is similar, with the naked eye

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  1. Cory

    mann's wholesale jewelry houston (1) As can be seen from the figure, the gas mass is 0.2g when it is fully reacted.
    (2) The quality of zinc is set x.
    zn 2HCL = zncl2 H2 ↑
    65 73
    x73g × 10%
    65x = 7373g × 10%
    x = 6.5g
    For: 10g-6.5g10g × 100%= 35%
    Answer: The mass score of copper in fake gold is 35%.
    Therefore, the answer is: (1) 0.2g; (2) 35%.

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