2,3/23=0,1(n)-Na
M(NAOH)=40G/M
0,1*40=4g
1(б)....2(а-б..б-в..в-г...г-а).....3(3KOH+H3PO4-->K3PO4+3H2O)....
<span>10HNO3(раз)+4Mg=4Mg(NO3)2+N2O+5H2O
N</span>⁺⁵+4e=N⁺
Mg⁰-2e=Mg⁺²
Ca+2HCl=CaCL2+H2
n Ca = 20/40 = 0.5 моль
m в-ва HCl= 20*70/100=14г
n Hcl = 0.383 моль
n HCl : n H2 = 2:1 ==> n H2 = 0.766 моль
V = 22.4*n = 17,16 л