Question

плиззз помогите номер 1.56 (а,б,в)

Answer 1

M(LiF)=7+19=26 n=100/26=3.8
M9SiO)=28+32=60 n=100/60=1.7
M(HBr)=1+80=81 n=100/81=1.23

Answer 2

спс

Answer 3

$n(LiF)= frac{m(LiF)}{M(LiF)} = frac{100}{26}= 3.85$ моль 
$M(LiF)=7+19=26$ г/моль

$n(SiO _{2} )= frac{m(SiO _{2} )}{M(SiO _{2} )} = frac{100}{60} =1.67$ моль 
$M(SiO _{2} ) =28+16*2=28+32=60$ г/моль 

$n(HBr)= frac{m(HBr)}{M(HBr} )= frac{100}{81} =1.23$ моль 
$M(HBr} =1+80=81$ г/моль