Quite a long one, but I need to know the formulas and the solutions.

a) Concentration of sodium carbonate
Concentration (M) = # mol/ vol (L)
List known data
# mol: 0.50 mol Na2CO3
Vol: 1.0 dm3
List unknown data
M
Converting dm3 into L
[tex]L=1.0dm^3\cdot\frac{1L}{1.0dm_3}=1.0L[/tex]Molarity
[tex]M=\frac{0.50molNa_2CO_3}{1.0L}=0.50molNa_2CO_3_{}[/tex]The molarity of Na2CO3 is 0.50 M