Question

When 0.265 g of sodium metal is added to an excess of hydrochloric acid, 2750 J of heat are produced. What is the enthalpy of the reaction as written? 2 Na ( s ) + 2 HCl ( aq ) ⟶ 2 NaCl(aq) + H2 ( g )

2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)

Answer 1

Dear student,

2 Na(s) + 2HA lag) - 2 Nall (aq) + H₂(g) The no. of moles of sodium in 0.263 g of sodium no. of moles Given mass Molar Mass = 0.0115 mol = 0.2658 22.99 g mol- 50, 0.015 mol of Na produce 24507 of head. We need to find the heat produced by a male of Na. 80 Dhoxo = 2750J x2 mot 0.0 115 mot = 239130.4 X2. J = 478260.8 ] = 478.26 x 103] = 478126 kJ So, the enthalpay of the reaction is 478.26 kJ

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