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    got these questions i dont understand

    minerals containing zinc are important to the human body,since zn2+ ion os important in many enzymes. zinc sulphate can be used as a dietary supplement in cases of zinc deficiency. the compound crystalises as a hydrated salt, ZnSO4.7H20
    and is soluble in water.
    the recomended daily allowance (rdA) of zinc if 15.2mg (0.0152g)

    1)calculate the relative molecular mass of hydrated zinc sulphate crystals ZnS04.7H20

    2)calculate the mass of hydrated zinc sulphate crystals which would be needed to be taken to obtain the rda for zinc

    3)normally this is taken via a 5cm3 dose of an aqueous soloution of hydrated zinc sulphate ZnSO4.7H2O. Calculate the concentration of this solution

    please help i have no idea how to do these questions
 
 
 
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