আধা লিটার ডেসিমোলার ঘনমাত্রার সোডিয়াম কার্বনেট এর ভর কত?
To solve this problem, let's analyze it step-by-step:

Step-1: Identifying Concentration and Volume-
Concentration of the Sodium Carbonate solution (Na2CO3) = 0.1 M (decimolar)
Volume of the solution = 0.5 L (half liter)

Step-2: Calculating Moles of Na2CO3-
Since concentration (C) is defined as moles of solute per liter of solution (C = moles/L), we can directly calculate the number of moles of Na2CO3 in the solution:
moles of Na2CO3 = C * V = (0.1 mol/L) * (0.5 L) = 0.05 mol

Step-3: Determining Molar Mass of Na2CO3-
The molar mass of Na2CO3 (M) is 106.0 g/mol, which represents the mass of one mole of sodium carbonate.

Step-4: Calculating Mass of Na2CO3-
Finally, we can determine the mass (m) of Na2CO3 in the solution using the following formula:
mass of Na2CO3 (m) = moles of Na2CO3 (n) * molar mass (M)
m = (0.05 mol) * (106.0 g/mol) = 5.3 grams

#Answer: 5.30 grams