Ответ:
дано
V1( ppa HNO3) = 40 mL
W1(HNO3) = 96 %
p1(ppa HNO3) = 1.5 g/ml
V2(ppaHNO3) = 30 mL
W2(HNO3) = 48%
p2(ppa HNO3) = 1.3 g/ml
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W(HNO3)-?
m1(HNO3) = V1( ppa HNO3) *W1(HNO3)*p1(ppa HNO3) / 100%
m1(HNO3) = 40*96*1.5 / 100% = 57.6 g
m1(ppa HNO3) = V1( ppa HNO3)*p1(ppa HNO3) = 40*1.5 = 60 g
m2(HNO3) = V2(ppaHNO3)*W2(HNO3)*p2(ppa HNO3)/100%
m2(HNO3) = 30*48*1.3 / 100% = 18.72 g
m2(ppa HNO3) = V2(ppaHNO3)*p2(ppa HNO3) = 30*1.3 = 39 g
m(общ HNO3) = m1(HNO3) + m2(HNO3) = 57.6 + 18.72 = 76.32 g
m( общ ppa HNO3) = m1(ppa HNO3) + m2(ppa HNO3) = 60 + 39 = 99 g
W(HNO3) = m(общ HNO3) / m(общ рра HNO3) * 100% = 76.32 / 99 * 100% = 77.1%
Объяснение: