Calculation of )Hf0 for Mg2+(aq.)

Please help this is worth a big grade and is due tomorrowstoichiometry calculation- Na weighs .53g water is 91.92 ml Patm= 30.03
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I am supposed to calculate the mole ratio and I had given these numbers: Mg=1.153, Si=0.679, H=1.153 and O=3.07. So which number
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