Answer : The mass of sphere is 92.727 grams.
Explanation :
To calculate the volume of sphere, we use the formula:
.....(1)
where,
r = radius of sphere
Given :
Diameter of sphere = 2.5 cm
Radius of sphere =
Now put all the given values in the above formula (1), we get:
To calculate mass of a substance, we use the equation:
.....(2)
Putting values in above equation (2), we get:
Hence, the mass of sphere is 92.727 grams.
Answer:
molality of sodium ions is 1.473 m
Explanation:
Molarity is moles of solute per litre of solution
Molality is moles of solute per kg of solvent.
The volume of solution = 1 L
The mass of solution = volume X density = 1000mL X 1.43 = 1430 grams
The mass of solute = moles X molar mass of sodium phosphate = 0.65X164
mass of solute = 106.6 grams
the mass of solvent = 1430 - 106.6 = 1323.4 grams = 1.3234 Kg
the molality =
Thus molality of sodium phosphate is 0.491 m
Each sodium phosphate of molecule will give three sodium ions.
Thus molality of sodium ions = 3 X 0.491 = 1.473 m