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Calculating Molarity

Answer these questions:

1. How many grams of NaH2PO4 are needed to react with 38.45 mL of 0.285 M NaOH?
NaH2PO4(s) + 2 NaOH(aq) Na3PO4(aq) + 2 H2O(l)

2. How many moles of which reactant are in excess when 356.0 mL of 0.268 M sulfuric acid reacts with 0.590 L of 0.177 M sodium hydroxide to form water and aqueous sodium sulfate?
? mol of either NaOH or H2SO4
[Write answers in scientific notation : ex. 2.54e12 g]
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