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How much heat is released when 28.0 g of lithium metal reacts as shown below? (Answer...

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How much heat is released when 28.0 g of lithium metal reacts asshown below? (Answer should come out to 448 kJ)
2 Li (s) + 2 H₂O (â„“) â†’ 2 LiOH (s) + H₂ (g)Î”HÂº = âˆ’222 kJ

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3.6 Ratings (266 Votes)

Î”HÂº = âˆ’ve = exothermic reaction = heat will be released

Molar mass of Li = 6.94 g/mol

2 Li (s) + 2 H₂O (â„“) â†’ 2 LiOH (s) + H₂ (g)Â Â Â Â Â Â Â Î”HÂº = âˆ’222 kJ

2 molÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 222 kJ heat is released

2 x 6.94 g = 13.88 gÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 222 kJ heat is released

28 gÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ?

Then,

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ? = ( 28 g/ 13.88 g) x 222 kJ heat is released

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 448 kJ heat is released

Therefore,

448 kJ heat is released when 28.0 g of lithium metal reacts.

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