vă rog dau coroană si Mă abonez
Răspunsuri la întrebare
Răspuns:
n=nr.moli ; n=m : M ; m=masa subst. ( g) ;M=masa molara ( g/moli )
Explicație:
9.
xg 146g yg zg
2Na +2 HCl = 2NaCl + H2
2.23g 2.36,5g 2.58,5g 2g
x=46.146 : 73=92g Na
n=92g : 23g/moli=4moli Na
y=146.117 : 73=234g NaCl
z=146 . 2 :73=4g hidrogen
n=4g : 2g/moli=2moli hidrogen
MHCl=1+35,5=36,5====>36.5g/moli
MNaCl=23+35,5=58,5----->58,5g/moli
10.
xg 25g yg
Cl2 + H2 =2HCl
2.35,5g 2g 2.36,5g
x=71 . 25 :2=887,5g clor
n=887,5g : 71g/moli=12,5 moli clor
y=25. 73 :2=912,5 g HCl
n=912,5g : 36,5g/moli=25moli HCl
MHCl=2 +35,5=36,5 ---->36,5g/moli
11.
xmoli 3moli ymoli zmoli
3H2SO4 +2 Al = Al2(SO4)3 +3 H2
3moli 2moli 1mol 3moli
x=3 .3 :2=4,5 moli H2SO4
y=3 .1 :2=1,5 moli sare
m=1,5moli .342 g/moli=513 g sare
z=3 .3 :2=4,5 moli hidrogen
M Al2(SO4)3=2.27 +3.32 +12 .16=342----->342g/moli