Răspuns :
p=m pur/m impur*100 => m pur = p*m impur/100=75*520/100=390g Zn pur
Zn + 2HCl -> ZnCl2 + H2
a) MZn=65g/mol
MHCl=36,5g/mol
65g Zn.........................2*36,5 HCl
390g Zn.........................xg HCl
x=73*390/65=438g HCl (md)
C=md/ms*100=>ms=md*100/C=438*100/36,5= Calculeaza !!
b) 65g Zn...........................1 mol H2
390g Zn.............................x moli H2
x=390/65= Calculeaza !!
c) MZnCl2=AZn+2ACl=65+2*35,5=136g/mol
65g Zn...................136g ZnCl2
390g Zn....................xg ZnCl2
x=390*136/65=Calculeaza !!
Zn + 2HCl -> ZnCl2 + H2
a) MZn=65g/mol
MHCl=36,5g/mol
65g Zn.........................2*36,5 HCl
390g Zn.........................xg HCl
x=73*390/65=438g HCl (md)
C=md/ms*100=>ms=md*100/C=438*100/36,5= Calculeaza !!
b) 65g Zn...........................1 mol H2
390g Zn.............................x moli H2
x=390/65= Calculeaza !!
c) MZnCl2=AZn+2ACl=65+2*35,5=136g/mol
65g Zn...................136g ZnCl2
390g Zn....................xg ZnCl2
x=390*136/65=Calculeaza !!