Quantos gramas de permanganato de potássio são necessários p...

% P/V= MASSA DO SOLUTO/VOLUME(L)X100                                                                                                                                              2 % = massa do soluto/250 mL x 100

10m = 2 . 25 

10m = 50

m = 50/10

m = 5 g de permanganato de potássio (KMnO4)

250---------100

x------------- 2

100x= 500/100= 5 g

2g_______100 ml

X_________250ml

100.x = 250 x 2

X= 500/100

X= 5g