If the density of pure water is 0.9922 g/mL at 40 ºC, calculate its theoretical molarity at that temperature. Report to 4 sig figs. (Only include numerical portion of your answer - do not include units)

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Thumper

Chemistry

22 April, 17:53

If the density of pure water is 0.9922 g/mL at 40 ºC, calculate its theoretical molarity at that temperature. Report to 4 sig figs. (Only include numerical portion of your answer - do not include units)

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Savanna Snow · Answer 1

Answer is: theoretical molarity of water is 55.1222 mol/L.

d (H ₂O) = 0.9922 g/mL.

M (H₂O) = 2 · Ar (H) + Ar (O) · g/mol.

M (H₂O) = 2 + 16 · g/mol = 18 g/mol.

c (H₂O) = d (H₂O) : M (H₂O).

c (H₂O) = 0.9922 g/mL : 18 g/mol.

c (H₂O) = 0.0551 mol/mL.

c (H₂O) = 0.0551 mol/mL · 1000 mL/L = 55.1222 mol/L.