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A 5.00 mL volume of a 0.60 M solution of phosphoric acid, H3PO4(aq), reacts with 45.00...

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Chemistry

A 5.00 mL volume of a 0.60 M solution of phosphoric acid,H3PO4(aq), reacts with 45.00 mL of 0.25 M NaOH(aq) according to thereaction below. The temperature of the solution rises from 26.0 °Cto 28.0 °C. Assume the volumes of the solutions are additive, thedensity of the final solution is 1.10 g mL–1 , the heat capacity ofthe solution is the same as water and the water produced by thereaction does not affect the volume of the resulting solution.Calculate the molar enthalpy change for the reaction.

H3PO4(aq) + 3 NaOH(aq) ® Na3PO4(aq) + 3 H2O(l) Hrxn = ?

Answer & Explanation Solved by verified expert
3.9 Ratings (521 Votes)
Number of moles n Molarity x volume in L nH3PO4 060M x 500 mLx103 LmL 3x103 mol nNaOH 025M x 4500 mLx103 LmL    See Answer
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