Question

how many sodium ions are present in 400cm3 of 0.5mol/dm^3 of sodium trioxocarbonate 5 solution

Answer 1

400cm3= 0.4dm3

Moles of sodium ions=0.2moles

If 1mole =6.022×10^23 ions

Then;

$0.2× 6.022×10^23$ =1.2×10^23 ions