N(H2SO4) = m/M =19.6/98 = 0.2 моль
n(S) = n(H2SO4) = 0.2 моль
m(S) = n*M = 0.2*32 = 6.4 г
ZnO+2HCl=ZnCl2 + H2O с кислотами
ZnO+SO3=ZnSO4 с кислотными оксидами
ZnO+2NaOH=Na2ZnO2 + H2O со щелочами
6,4/32=х/18
х=6,4*18/32=3,6 г
P+…->P₂O₅+…->Na₃PO₄+…->NaH₂PO₄<span>
1. </span>4P+5O₂ = 2P₂O₅
2. <span>2 P</span>₂<span>O</span>₅<span> + 12 NaOH = 4 Na</span>₃<span>PO</span>₄<span> + 6 H</span>₂<span>O</span><span>
3. </span>Na₃PO₄+2H₂O= 2NaOH+NaH₂PO₄ .