Răspuns:
Explicație:
1.m=20 g
nO2=?
nN2=?
nMg=?
nCa=?
nZn=?
n=m/M
MO2=2*AO=2*16=32
n=20 g/32g/mol=0,625 moli
MN2=2AN=2*14=28
n=m/M=20g /28g/mol=0,714 moli
AMg=24
n=m/A=20/24=0,833 moli
ACa=20
n=m/A=20 /20=0,1 moli
AZn=65
n=m/=20/65 =0,307 moli
2.n=5 moli
m K=? AK=39 m=n*AK=5*39 =195 g
mB=? AB=11 m= n*A=5*11=55 g
mCl2=? MCl2=71 g/mol m=n*M=355 g
mMn=? AMn=55 m=n*A=5*55=275 g
mFe=? AFe=56 m=n*A=5*56=280g
mCr=? ACr=52 m=n*A=5*52=260 g
mI2=? MI2=252g/mol m=n*M=1260 g
mSe =? ASe=77 m=n*A=5*77=385 g