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Determine the number of sodium ions contained in 25cm^3 of 0.5M sodium carbonate solution.

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Just like the one I just did

25 cm^3 ( 1 liter / 1000 cm^3) = 0.025 liters
0. 5 mols/liter * 0.025liters = 0.0125 moles
2 Na ions / Na2CO3 molecule
2 (Avagadro's number) * 0.0125

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