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    I believe the answer is D

    Just use the mole = vol. x conc. formula
    So they are asking how do you get the solution of 1 dm3 to have a concentration of 0.1 moldm3
    First, you have to think how many moles there are which is 0.1 mol
    The volume of the solution required would therefore have to equal 0.1 mol and that's when you use the formula:

    0.1 mol = (vol. in dm3) x 0.2 moldm3

    Rearrange it to get 0.5 dm3 and convert it to cm3 by multiplying by 1000 to get 500 cm3
 
 
 
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