CH3COOH +CH3OH <span> = </span>CH3COOCH3<span> + H2O
</span><span>CH3COOCH3 + H2O = CH3COOH + CH3OH
</span>CH3COOH<span> + KOH = </span>CH3COOK<span> + H2O
</span>
M(Ca(H2PO4)2 = 40 + 1*4 + 31*2 + 16*8 = 234
W(Ca) = Ar(Ca) * n / Mr(Ca(H2PO4)2) *100% = 40 *1 / 234 *100% =17%
W(H) = Ar(H) *n / Mr(Ca(H2PO4)2 *100% = 1 * 4 / 234 *100% = 1,7%
W(P) = Ar(P) * n / Mr(Ca(H2PO4)2 *100% = 31 *2 / 234 *100% = 26,5%
W(O) = Ar(O) *n / Mr(Ca(H2PO4)2 *100% = 16 * 8 / 234 *100% = 55%
А) BaCl2+Na2SO4=BaSO4(осадок) + 2NaCl
H2SO4+Ba(OH)2=BaSO4(осадок)+2H2O
б)KOH+HCl=KCl+H2O
2K+Cl2=2KCl
в)3Mg(OH)2(изб)+2H3PO4=Mg3(PO4)2(осадок)+6H2O
3MgO+P2O5=Mg3(PO4)2
44-CO2(углекислый газ)
28-N2(азот)