Answer to Question #199130 in General Chemistry for Maria

Question

When 1.017 g of pure sodium metal is added to 125.0 mL of distilled water, the temperature of the water changes from 18.6 °C  to  30.2°C.  Water is in excess. The reaction is: (5 marks)

       Na (s)   +     H2O (l)     →      NaOH (aq)      +     ½  H2 (g)          ΔH = ?

Calculate the molar enthalpy of sodium as is dissolves in water  ( ΔHr) Show a complete, organized solution including all units and the final answer rounded to the correct number of significant digits.

Answer 1

Molar enthalpy of sodium=$-389.7kJ$