Question

QUESTION 3 When pure hydrogen and fluorine change into HF, the reaction releases heat. What does this tell you about the reaction? the formation of pure hydrogen and fluorine from HF would absorb heat the formation of pure hydrogen and fluorine from HF would be exothermic the backward reaction would be exothermic

Answer 1

03, H₂ + f2 HF Hydrogen Fluorine Hydrogen flucide heat is released in this reaction, means this reaction is exothermic - enthalpy change, an= negative (product formed is more stable than reactants) of reaction reversed Hf h + f2 44 = positive (as sevuse reaction, magnitude same, eign sevened) heat is required absorbed in this reaction, means this reaction is endothermic. . (products here formed are less stable than reactants) Answer: formation of pure hydrogen and flumine from Hf would absub heat. m= Mass of ho= 250 g Initial temperature Ti = 30°C final temperature, T2= 65°C Change in temperature, OT = Ty-T, = (15-30) C = 35°C Specific heat, c of tho = 4.184 Il gic Heat gain = mcot = (250g) (4.184 I )(35°C)= 36610 J U CIJ=10-3ks) heat gain = 36610 J = 36610 X10-3kJ= 36.61 kJ Answer: 36.6kJ Qui