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AS Chemistry question...

This probably isn't even a tough question but I can't remember how to do it for the life of me and its too specific to search on google.
0.2g of an unknown metal reacts with 25cm^3 of HCl, 200cm^3 hydrogen gas is released.
The equation for this is:
X + 2HCl -> XCl2 + H2
Find the number of moles of metal X used in the reaction.
Any help appreciated.

Reply 1

JRM3PM

If it's at standard temperature and pressure, you could you use ideal gas formula to find the number of moles of hydrogen. The number of moles of hydrogen would be equal to the number of moles of metal X.