What gas is given off when metals react with acid?
Hydrogen (H2). This was the method used by the first manned-balloon flight using hydrogen (brainchild of Jacques Charles - the namesake for Charles law)
A quarter tonne of sulfuric acid was reacted with half a tonne of iron to fill
Hydrogen(H2) gas is given of when metals react with an acid.
It depends on the metal, but when you work with Aluminum as an example, the reaction becomes:
#color(blue)("2Al"(s))# #color(blue)(+)# #color(blue)(6"HCl"(aq) -> 2"AlCl"_3(aq))# #color(blue)(+)# #color(blue)(3"H"_2(g))#
Another way to see this is the depiction of the reaction mechanism. At a General Chemistry class, you do not need to know this mechanism, but maybe it'll help to get a "behind-the-scenes" on what happens.
What you should notice is that indeed, two
After three steps, we form two equivalents of
As an interesting aside, if we had two more equivalents of
#color(blue)(2"Al"(s))# #color(blue)(+)# #color(blue)(8"HCl"(aq) -> 2"AlCl"_4^(-)(aq))# #color(blue)(+)# #color(blue)(3"H"_2(g) + "2H"^(+)(aq))#
Since aluminum now has no more valence electrons to donate, it must utilize its empty