1.) A sample of gaseous hydrogen gas was collected by the displacement of water

Question

1.) A sample of gaseous hydrogen gas was collected by the displacement of water at 21.8°C and a barometric pressure of 752 torr. The volume under these conditions was measured to be 35.76 mL. The gas was generated by the reaction of a sample of metal weighing 15.45 grams and containing magnesium metal. The reaction was carried out with with HCI as Mg(s) + 2 HCl(aq) MgCl2(aq) + H2(g) a.) How many moles of hydrogen gas were produced by this sample? (See Lab Notebook pages 10-12) b) Calculate the % m/m of magnesium in the sample.

Explanation / Answer

1.) A sample of gaseous hydrogen gas was collected by the displacement of water

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