Reactive Metal Fires In the chemistry lab, one often has to work with very react

Question

Reactive Metal Fires In the chemistry lab, one often has to work with very reactive metals such as sodium and lithium. Unfortunately, these same metals can react vigorously with water or oxygen and cause fires. Given the following information: AH AH J (kl/mol) J (kl/mol) Li20(s) -597.9 Li (aq) -278.5 Na20(s) -416 Na (aq) -240 K20(s) -361 K (aq) 251 co(g) 110.5 CO2 (g) -393.5 H20 (l) -286 OH (aq) -230 CCl4 (l) -135 SiO2 (s) -911 LiCl(s) -409 NaCl(s) -411 CI (aa) -167 KCI (s) -436 Calculate AH for the following reactions: 1 pts Submit Answer Tries 0/8 2Li(s) co2 (g) Li20(s) co(g)

Explanation / Answer

1) 4Li(s) + O2(g) -------> 2 Li2O (s)

dHo = -597.9 kJ/mol

2) 2Li(s) + CO2(g) ------->Li2O (s) + CO (g)

dHo = -314.9 kJ/mol

Exp :

dHo = dHf of products - dHf of reactants

dHo = [ -597.9 + -110.5] - [-393.5]

dHo = -314.9 kJ/mol

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