Respuestas
SOLUCIÓN :
1) sto = 60 g
sol = 40 ml sol
sto =?
sol = 2 L
60 g sto / 40 ml sol * 2 L sol* 1000 ml sol / 1 L sol = 3000 g sto
respuesta b)
2) sto = 20 g
sol = 1 L
moléculas NaOH/ml sol =?
20 g sto/ 1L sol*1 L sol/ 1000 ml sol* 1 mol sto NaOH/ 40 g sto* 6.02*10²³ moléculas NaOH / 1 mol sto = 3.01*10²⁰ moléculas NaOH .
respuesta la b)
3) sto = 3.5 g sacarosa C12H22O11 Pm = 342 g/mol
Sol = 100ml sol
d sol = 0.885 g/ml
m=?
100ml sol* 0.885g sol/1 ml sol= 88.5 g sol
gsolve = 88.5 g sol - 3.5 g sto = 85 g solve * 1Kg sol/1000g solve = 0.085 Kg solve
m= 3.5 g sto/( 342 g/mol * 0.085 Kg)
m= 0.12 m. respuesta b) .
4) sto = 60 g Na2SO4
sol = ? ml
20 %m/m
dsol = 1.2 g/ml
60 g sto * 100g sol/ 20 g sto * 1 ml sol / 1.2 g sol = 250 ml sol respuesta b)
5) g sto = ? AgNO3
sol = 1L
10% m/m
dsol = 1.15 g/ml
1 Lsol * 1000 ml sol/1 L sol * 1.15 gsol / 1 ml sol * 10 g sto/ 100g sol
= 115 g sto AgNO3. respuesta b)