Question

Exercițiul ăsta m-a încuiat... =)))
Cine mă ajută?

Answer 1

a) 100gtinctura ...................... 10g iod
15g tinctura ....................... x1g iod

x1= 15×10 / 100 = 1.5

b)
100g tinctura.............10g iod
500g tinctura............x2 g iod

x2 = 500×10 / 100 = 50g iod

dalcool = m / V
malcool = 500-50 = 450
0.8 = 450 / V
=> V = 450 / 0.8
V= 562.5 ml alcool

c) c% = md×100 / ms
c% = 15%
ms= 500g

md = c% × ms / 100
md = 15 × 500 / 100 = 75g iod