Ответ:даноm(ppa NaNO3) = 500 gW(NaNO3) = 20%-m(H2O) = 100 g-------------------------W1-?m(NaNO3) = 500 * 20% / 100% = 100 gm1(ppa NaNO3) = 500 — 100 = 400 gW1(NaNO3) = m(NaNO3) / m1(ppa NaNO3) *100% = 100 / 400 * 100% = 25%ответ 25%
Объяснение:
CuCi2+NaOH=Cu(OH)2+NaCl
Cu^(+2)+CI^(+1)+Na^(+1)+OH^(+1)=Cu(OH)2+Na^(+1)+CI^(+1)
Cu^(+2)+OH^(+1)=Cu(OH)2
CH2NH2COOH+HCl=CH2COOH
I
NH3Cl
валентность была 3 стала 4
2C2H5J+2Na=C4H10+2NaJ
н-бутан
CH3-CH2-CH2-CH3(AlCl3) =CH3-CH-CH3 -2-метилпропан
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CH3
n(Na)=46/23=2моль; n(C4H10)=1моль; m(C4H10)=1*58*0,25=14,5г;
m(СН3-СН-СН3)=1*58*0,75=43,5г;
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CH3
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