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Ca + 2HCl -> CaCl₂ + H₂
14g x y
x=73g*14g/40g=25,55g
y=25,55g*2g=73g=0,7g
22,4dm³ - 2g H₂
z - 0,7g H₂
z= 0,7g*22,4dm³/2g= 7,84dm³