<span>2Ca + O</span>2<span> = 2CaO</span>
<span>CaO + 2 HNO3 = Ca(NO3)2 + H2O
</span><span>H</span>2<span>TeO</span>3<span> + Ca(NO</span>3<span>)</span>2<span> = CaTeO</span>3<span> ↓ + 2HNO</span>3
t
CH₄ -------->C + 2H₂
-----------------------------------------
2.4 x
2C6H5OH+2NaOH=2C6H5ONa+H2
80 232
m=pv=1.38*4.97=6.8586
x=6.8586*35\%\100=2.4
x=2.4*232\80=2.3
1). 150*68% /100=102(кг)-масса меди в сплаве; 2). 150*32% /100%=48(кг)-масса цинка в сплаве.