Дано
W(HNO3)=48%
p(HNO3)=1.3 g/mL
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Cm-?
m(ppa)=V*p=1000*1.3=1300 g
m(HNO3)=m(ppaHNO3)*W(HNO3) /100% = 1300*48% / 100% = 624 g
M(HNO3)=63 g/mol
n(HNO3)=m(HNO3) / M(HNO3) = 624/63 = 9.9 mol
Cm = n(HNO3) / V = 9.9 / 1 = 9.9 mol / L
ответ 9.9 моль/л