Bonjour,
Concentrations massiques (V = 200 mL = 0,200 L) :
. du glucose : Cm(glucose) = m(glucose)/Volume = 2,65/0,200 = 13,25 g.L⁻¹
. du saccharose : Cm(saccharose) = 2,49/0,200 = 12,45 g.L⁻¹
. du sodium : Cm(sodium) = 0,274/0,200 = 1,37 g.L⁻¹
Masses molaires :
. M(glucose) = 6xM(C) + 12xM(H) + 6xM(O) = 6x12 + 12x1 + 6x16 = 180 g.mol⁻¹
. M(saccharose) = 12x12 + 22x1 + 11x16 = 342 g.mol⁻¹
. M(sodium) = 23 g.mol⁻¹
Concentrations molaire : C = n/V = (m/M)/V = (1/M) x (m/V) = Cm/M
. C(glucose) = 13,25 / 180 = 7,36.10⁻² mol.L⁻¹
. C(saccharose) = 12,45 / 342 = 3,64.10⁻² mol.L⁻¹
. C(sodium) = 1,37 / 23 = 5,96.10⁻² mol.L⁻¹
