Urgent chemistry gas volume question help

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    I have a test tomorrow and just came along this question whilst revising and I'm really stuck! Any help would be amazing!! (i've just started year 12!)

    0.52g of sodium was added to 100cm^3 of water, Calculate:
    a) the volume of hydrogen evolved
    b) The concentration of the sodium hydroxide solution produced, assuming the volume of water does not change.

    Equation: 2Na(s)+ 2H2O(l) -> 2NaOH(aq) + H2(g)
    Thank you!!!
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    please help?!?!
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    What have you tried so far?
 
 
 
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