x / .. owLv21 online teachin .. G Gwen The Follow ng In, × × st cengagenow.com/i

Question

x / .. owLv21 online teachin .. G Gwen The Follow ng In, × × st cengagenow.com/ilm/takeAssignment/takeCovalentActivity do?locator-assignment-take&takeAssignme; Given the following information Energy of sublimation of K(s) 77kJ mol Bond energy of HCl-427 kJ/mol lonization energy of K(g)-419 kJ/mol Electron affinity of Cl(g)- -349 kJ mol Lattice energy of KCl(s)-705 kJ/mo Bond energy of H 432 kJ/mol 1 pt 1 pt 1 pt Calculate the net change in energy for the following reaction 2K(s) + 2HCl(g) 2Kcus) + H2(g) Submit Answer Try Another Version 5 item attempts remaining Type here to search DOLL F6 F8 F10 F11 F12 F3 FS , 2 3 4 5 6 8

Explanation / Answer

The following steps occur in the reaction.

1):2k(s) ----->2k(g)=144kj

2):2K(g)------>2k+ + 2e. =838kj

3):2H--cl. ---->2H+. +2Cl-. =854kj

4):2Cl- +2k+ ---->2kcl =1410kj

5):2H+ ----->H2 =865

Therefore net energy=1+2+3-4-5

=-438kj and reaction is thus exothermic.

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