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176...................................................x
C6H6+CH3Cl—>C6H5-CH3+HCl
78....................................................36,5
p=m/V
m=p•V=176 grame de C6H6
x=36,5•176/78=82,36 grame HCl
PV=nRT
V=(m/M•R•T)/P
V=(2,25•0,082•500)/4
V=23 litri aproximativ de HCl