calc the volume of solution that contains 5,3 g of sodium carbonate if the solution has a concentration of 0,4 mol-dm (to the power of minus 3)

To calculate the volume of a solution, you need to use the formula:

Volume (in dm³) = Mass (in g) / Concentration (in mol/dm³)

Let's calculate it step by step.

Step 1: Convert the mass of sodium carbonate from grams to moles.
To convert grams to moles, you need to use the molar mass of sodium carbonate, which is 105.99 g/mol. Use the formula:

Number of moles = Mass (in grams) / Molar mass

Number of moles = 5.3 g / 105.99 g/mol = 0.05 moles

Step 2: Use the concentration to calculate the volume.
The concentration is given as 0.4 mol/dm³.

Volume (in dm³) = Mass (in g) / Concentration (in mol/dm³)
Volume = 0.05 moles / 0.4 mol/dm³ = 0.125 dm³

Therefore, the volume of the solution that contains 5.3 g of sodium carbonate with a concentration of 0.4 mol/dm³ is 0.125 dm³.