2S+I2=>2SI
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1)
x+y=10
x/(x+y)=0.05
y=10-x
x/(x+10-x)=0.05
x/10=0.05
x=0.05*10
x=0.5
y=10-0.5=9.5
2)
(200*0.12+120*0.26)/(200+120)*100=17.25%
3)
(40*0.7)/(x+40)=0.09
28/(x+40)=0.09
28=0.09*(x+40)
0.09x+3.6=28
0.09x=28-3.6
0.09x=24.4
x=24.4/0.09
x=271.111111 грамм
4)
(300*0,33)/(300-130)*100=58,235294117647058823529411764706%
<span><span>NaCl</span>+<span>H2O</span> → <span>NaOH</span>+<span>HCl
</span></span><span><span>Na2O</span>+<span>H2O</span> → <span>2<span>NaOH</span></span></span><span><span>2
<span>Na</span></span>+<span>2<span>H2O</span></span> → <span>2<span>NaOH</span></span>+<span>H<span>2</span></span></span>
4P + 5O2 = 2P2O5
P(0) -5e = P(+5) 4 в-ль
O(0) + 2e = O(-2) 10 ок-ль
2PH3 + 4O2 = P2O5 + 3H2O
P(-3) -8e = P(+5) 2 в-ль
O(0) +2e = O(-2) 8 ок-ль