Odpowiedź:1) 16% 2)26,7% 3) 41,8%
dane:
1. mr1=160g
c%1=20%
mH2O--40g
szukane ;
ms i C%2
obliczenia:
liczymy ms=x
20g -------100g
x -------160g
x= 20g * 160g/100g
x=32g
wzór : C%=ms/mr *100%
ms=32g
mr2=po dodaniu 40g wody=160 +40g=200g
C%2=ms/mr2 *100%
C%2= 32g/200g*100%
C%2= 16%
2)
dane
mr1=160g
c%1= 20%
szukane;
mr2,C%2
obliczenia:
20g--------100g
x -------- 160g
x= 32g-->ms1
mr2= 160g -40g = 120g
C%2=ms1/mr2 *100%
C%2= 32g/120g*100%
C%2=26,7%
3.
dane:
C%1=20%
mr1=160g
szukane:
ms1,ms2,C%2
obliczenie:
liczymy ms1
20g --------100g
x -------- 160g
x=32g
ms2= 32g +60g =92g
mr2= 160g +60g=220g
C%2=ms2/ mr2 *100%
C%2= 92g/220g*100%
C%=41,8%