How many grams of 0.491 wt% aqueous HF are required to provide a 50% excess to react

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How many grams of 0.491 wt% aqueous HF are required to provide a 50% excess to react with 25.0 mL of 0.0236 M Th4+ by the reaction Th4+ + 4F- n ThF4(s)?
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