Answer to Question #184517 in General Chemistry for Riley Grace Sample

Question

When 0.617 g of sodium metal is added to an excess of hydrochloric acid, 6410 J of heat are produced. What is the enthalpy of the reaction as written?

2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)

Answer 1

Mole of sodium=mass÷molar mass

Mole= 0.617÷23=0.026

∆H=q÷n

∆H= 6410÷0.026=246538.46J