Предмет: Математика, автор: andrew20004

смешали 50г раствора с концентрацией 12% с 40г раствора 18% раствора. какова концентрация раствора

Ответы

Автор ответа: sonjagorlova
0
Это химия, вообще-то
Автор ответа: АлВикторовна
0
50*0,12=6 г - вещества в 1 растворе
40*0,18=7,2 г- вещ-ва во 2 р-ре
6+7,2=13,2 г - всего в-ва
50+40=90 г - всего р-ра
13,2/90*100=14,67 процентов - концентрация конечного раствора
Ответ: 14,67 процентов
Похожие вопросы
Предмет: Английский язык, автор: daragrach2020
срочно англиский 7 класс Fill in the blanks below with words from this box:
harvest
sweaters
chilly
sets
migrating
change
November
farmers
before
red
orange
yellow
scarecrows
autumn
season
back
October
grapes
pumpkins
corn
September
country
foliage
ground
coats
crows
Fall
Fall, which is also called _____________, is the ____________ when the leaves
_____________ color and fall to the _______________. In North America, it is
also the season when kids head ______________ to school.
The Weather
Fall begins with warm weather in ______________, but as the season continues
into ______________ and ________________, the sun _____________ earlier
and earlier everyday and the weather becomes _______________. And so, people
put away their shorts and t-shirts and take out their ______________ and
_____________.
The Harvest
In fall, _____________ are busy working in their fields. They have to
______________ their crops before the cold of winter comes. ____________,
now big and orange, are ready for making pies. ______________ quickly ripens on
the cob. Wine makers pick their plump, juicy, purple _______________ from the
vine. _______________ stand guard in the fields to keep the ______________
from stealing the crops ______________ the farmers can gather them.
The Country
If you are fortunate, you can visit the ____________ in
the fall and see the spectacular ______________ on
the trees as the leaves change to _____________,
____________, brown, and ______________.
Overhead, birds are _______________, heading south
to their winter homes.
Предмет: Математика, автор: gammermarina22