Answer:
Explanation:
Potassium trioxonitrate(V) is KNO₃.
1. Find the molar mass of the solute
The molar mass of KNO₃ is 39.098g/mol + 14.007g/mol + 3×15.999g/mol = 101.102g/mol.
2. Convert the mass of solute, 20.02g, into number of moles
- number of moles = mass in grams / molar mass
- number of moles = 20.2g / 101.102g/mol = 0.1998mol
3. Assume that the volume of the solution is equal to the volume of water
This is a rough approximation, but it is necessary since you do not have the density of the solution:
- density = mass / volume
- 1.00 g/cm³ = 100g / volume
- volume = 100g × 1.00g/cm³ = 100cm³
Convert 100cm³ to dm³:
- 100cm³ × 1dm³ / 1,000cm³ = 0.1 dm³
4. Calculate the solubility is mol/dm³
- 0.1998 mol / 0.1dm³ = 1.998mol/dm³ ≈ 2.00mol/dm³
It is rounded to three significant digits to match the choices.
