1. дано
m(H2O) = 80g
m(NaCL)=5 g
m(KNO3)= 15g
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W(NaCL)-?
W(KNO3)-?
W(NaCL) = m(NaCL) / ( m(H2O + m(NaCL) + m(KNO3)) * 100%
W(NaCL) = 5 / (80+5+15) * 100% = 5 %
W(KNO3) = m(KNO3) / ( m(H2O + m(NaCL) + m(KNO3)) * 100%
W(KNO3) = 15 / (80+5+15)*100% = 15%
ответ 5% , 15%
2. дано
V(ppa) = 100mL
m(H2SO4) = 9.8 g
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Cm-?
M(H2SO4) = 98 g/mol
Cm = m(H2SO4) / (M(H2SO4)* V(ppa)) = 9.8 / (98*100) = 0.001M
ответ 0.001М