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Консультация № 160981
20.02.2009, 12:54
0.00 руб.
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Из 700 г 60%-ной серной кислоты выпариванием удалили 200 г воды. Чему равна массовая доля оставшегося раствора?
Обсуждение
20.02.2009, 13:20
общий
это ответ
Здравствуйте, Викторовна!
Масса исходного раствора m1=700 г
Массовая доля серной кислоты в этом растворе [$969$]1=60%
Масса серной кислоты m(H2SO4)=m1*[$969$]1=700г*60%=420 г
Так как из раствора удаляется 200 г воды, его масса уменьшается на 200 г
m2=m1-200г=500г
Массовая доля кислоты в полученном растворе
[$969$]2=m(H2SO4)/m2=420/500=84%
Масса исходного раствора m1=700 г
Массовая доля серной кислоты в этом растворе [$969$]1=60%
Масса серной кислоты m(H2SO4)=m1*[$969$]1=700г*60%=420 г
Так как из раствора удаляется 200 г воды, его масса уменьшается на 200 г
m2=m1-200г=500г
Массовая доля кислоты в полученном растворе
[$969$]2=m(H2SO4)/m2=420/500=84%
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