Question

хелп
буду благодарна​

Answer 1

m(р-ну) = 150 g

W(HNO3) = 0.15 = 15 %

m(р-ну1) = 50 g

W(HNO3 1) = 0.25 = 25%

W(HNO3 2) - ?

m(HNO3) = 0.15 * 150 = 22.5 g

m(HNO3 1) = 0.25 * 50 = 12.5 g

W(HNO3 2) = (12.5 + 22.5) / 200 = 35 / 200 = 0.175 = 17.5%