In a lab, we need to collect H 2 gas from thereaction of some unknown metal with

Question

In a lab, we need to collect H2 gas from thereaction of some unknown metal with HCl. In a pre-lab question, I'msupposed to calculate the maximum number of moles of H2that could be collected if T = 20°C and Patm = 760torr. How would you do this question?
(I was thinking of using PV = nRT but the temperature is notat STP and I can't calculate the volume, since I don't have thenumber of moles). In a lab, we need to collect H2 gas from thereaction of some unknown metal with HCl. In a pre-lab question, I'msupposed to calculate the maximum number of moles of H2that could be collected if T = 20°C and Patm = 760torr. How would you do this question?
(I was thinking of using PV = nRT but the temperature is notat STP and I can't calculate the volume, since I don't have thenumber of moles).

Explanation / Answer

The metal most likely doesn't contain any hydrogen, so all thehydrogen will come from the HCl. If there is a reaction between the metal and the HCl and there isan abundance of metal, almost all of the HCl you put in will letloose it's hydrogen. This makes the number of moles ofH2 to half of the ammount of HCl. (Since youneed 2 H for every H2)

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