ms = 29,2 g, c% = 25%
stim ca c% = mdx100/ms
=> md = msxc%/100
= 29,2x25/100 = 7,3 g HCl
7,3 g niu moli
Zn + 2HCl --> ZnCl2 + H2
2x36,5 1
=> niu = 7,3x1/2x36,5 = 0,1 moli H2
miu.H2 = 2 g/mol
niu = masa/miu
=> masa = niuxmiu = 0,1+2 = 0,2 g HCl
niu = V/V.molar = V/22,4
=> V = niux22,4 = 2,24 L H2