The determination shows the sample to be840 zinc explain, Chemistry

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The determination shows the sample to be840 zinc explain

The purity of a sample containing zinc and weighing 0.198g is determined by measuring the amount of hydrogen formed while the sample reacts with an excess of hydrochloric acid. The determination shows the sample to be84.0% zinc. Explain what amount of hydrogen (measured at STP) was obtained?

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Chemistry: The determination shows the sample to be840 zinc explain

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