Answer:
0.0733 mol /dL
Explanation:
Mole -
Moles is denoted by given mass divided by the molecular mass ,
Hence ,
n = w / m
n = moles ,
w = given mass ,
m = molecular mass .
From the information of the question ,
w = 116.0 g
As we know, molecular mass of aluminum sulfate ,
m = 342.15 g/mol
n = w / m
n = 116.0 g / 342.15 g/mol = 0.33 mol
Molarity -
Molarity of a substance , is the number of moles present in a liter of solution .
M = n / V
M = molarity
V = volume of solution in liter ,
n = moles of solute ,
The unit is mol / L ,
Hence , from the question, the value of molarity is asked ,
From the information of the question ,
V = 450 mL ,
Since,
1 mL = 0.01 dL
As, the unit asked in the question is in dL,
V = 4.5 dL
n = 0.33 mol ( as calculated above )
Using the above formula ,
M = n / V
M = 0.33 mol / 4.5 dL
M = 0.0733 mol /dL
M =
