2.15 mol dm-3
0.74 mol dm-3
0.60 mol dm-3
0.57 mol dm-3
Correct answer is B
Molar mass of Na2SO4 = 2(Na) + S + 4(O) = 2(23.0 g/mol) + 32.1 g/mol + 4(16.0 g/mol) = 46.0 g/mol + 32.1 g/mol + 64.0 g/mol = 142.1 g/mol
Now, we can calculate the number of moles of Na2SO4 in the solution:
Number of moles = Mass of the salt / Molar mass
Number of moles = 10.5 g / 142.1 g/mol ≈ 0.0739 mol
Next, we need to find the volume of the saturated solution, given as 100 cm³, and convert it to liters:
Volume of solution = 100 cm³ = 100 cm³ / 1000 cm³/dm³ = 0.1 dm³
Finally, we can calculate the solubility in mol/dm³:
Solubility = Number of moles / Volume of solution
Solubility = 0.0739 mol / 0.1 dm³ ≈ 0.739 mol/dm³
Rounded to two decimal places, the solubility of sodium tetraoxosulphate (VI) at 30°C is approximately 0.74 mol/dm³.
Therefore, the correct option is:
0.74 mol dm-3.
Solubility = 10.5 g / 100 cm3 * 142 g/mol = 0.739 mol/dm3
Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?...
The process that occurs when two equivalent forms of a compound are in equilibrium is ...
The efficiency of a solid catalyst to increase reaction rates depends on its ...
Which of the noble gases has the greatest ionization energy ...
Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectiv...
When excess chlorine is mixed with ethene at room temperature, the product is...
CxHY + 4O2 → 3CO2 + 2H2O. The hydrocarbon, CxHY, in the reaction above is?...