1)2P+3Mg>Mg3P2
2)Mg3P2+6HOH>3Mg(OH)2+2PH3
3)2PH3+4O2>P2O5+3H2O
4)P2O5+3H2O>2H3PO4
5)2H3PO4+3Ca(OH)2>Ca3(PO4)2+6H2O
30*0,05=1,5 мл кислоты
1,5/22,4=0,067 моль
0,067*170=11,384 г
11,384*100/2=569,2 мл раствора
1.
21.8 г x г<span>
C2H5Br + NaOH </span>→ C<span>2H5OH + NaBr
109 г/mol 46 г/mol
x = 21.8 * 46 / 109 = 9.2 г
2.
18.4 г x г
C2H5OH + CuO </span>→ CH3CHO + Cu↓<span> + H2O
46 г/mol 44 г/mol
</span>x = 18.4 * 44 / 46 = 17.6 г
3.
73.6 г x л
2<span>C3H5(OH)3</span><span> + </span>6K → 2<span>C3H5O3K3</span><span> + </span>3<span>H2</span>↑
184 г/mol 67.2 л/mol
x = 73.6 * 67.2 / 184 = <span>26,88 л </span>≈ 27 л
( = Это не точно = )