дано
m(ppa H2SO4) = 320 g
W(H2SO4) = 5%
+m(H2O) = 20 g
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W1(H2SO4)-?
m общ (ppa H2SO4) = 320 + 20 = 340 g
m(H2SO4) = 320 *5% / 100% = 16 g
w1(H2SO4) = m(H2SO4) / m общ(ppa H2SO4) *100% = 16 / 340*100% = 4.7%
ответ 4.7 %
1) 2,2-диметил-3-этилпентан
2)3,3-диметил-5-этилгептан
Ответ:
Объяснение:
N(IV)O(II), Cl(I)O(II), Mn(VII)O(II), N(III)H(I), Ba(II)O(II), Fe(II)S(II), K(I)N(III), Ca(II)H(I)
A)2Na + 2H₂O = 2NaOH + H₂↑
2Na⁰ + 2H₂O = 2Na⁺ +2OH⁻ + H₂↑
2Na⁰ - 1e= 2Na⁺
2H⁺ + 1 e = H₂⁰
б) 6Na + N₂ = 2Na₃N
6Na⁰ - 1e = 6Na⁺
N₂° + 3 e = 2N⁻³