1. When 0.291 g of sodium metal is added to an excess of hydrochloric acid, 3030 J of heat are produced. What is the enthalpy of the reaction as written?
2Na(s)+2HCl(aq)⟶2NaCl(aq)+H2(g)
2. The reaction for the combustion of propane is C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(l)Δ=−52 6.3kcalmol. How much heat is released when 27.3 g of propane is burned?
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