Oblicz stężenie % etanolu jeżeli 30g tej cieczy rozpuścimy w 270g wody.
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300g - 100%
30g - 10%
Mam nadzieję, że pomogłam. :)
mw = 270g
mr = ms + mw = 30g + 270g = 300g
300g ---- 100%
30g ---- x %
x = (30g * 100%) : 300g = 10% <--- Cp