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conc mol vol

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    which of the following contains the most chloride ions?
    A) 10cm3 of 3.3x10-2 mol/dm3 aluminium chloride solution
    B) 20cm3 of 5x10-2 mold/dm3 calcium chloride solution
    C) 30cm3 of 3.3x10-2 mol/dm3 hydrochloric acid
    D) 40cm3 of 2.5x10-2 mol/dm3 sodium chloride solution

    i converted units so all were in dm and i got B and D as the same which was 1000 moles but the mark scheme stated B was the correct answer why is this if b and d are both the same
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    (Original post by hanakm)
    which of the following contains the most chloride ions?
    A) 10cm3 of 3.3x10-2 mol/dm3 aluminium chloride solution
    B) 20cm3 of 5x10-2 mold/dm3 calcium chloride solution
    C) 30cm3 of 3.3x10-2 mol/dm3 hydrochloric acid
    D) 40cm3 of 2.5x10-2 mol/dm3 sodium chloride solution

    i converted units so all were in dm and i got B and D as the same which was 1000 moles but the mark scheme stated B was the correct answer why is this if b and d are both the same
    In one mole of calcium chloride (CaCl2), there are two moles of Cl- ions
 
 
 
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