What is atomic mass of flourine?
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moles H3PO4 = 87.0 g / 97.9937 g/mol = 0.8878 mol
kg of water = 0.0130 kg
kg of water = 0.0130 kg
molality = 0.8878 mol / 0.0130 kg = 68.3 molal
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18 atomic units....
hope it helps
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