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Ce cantitate de acid acetic cu 20% impuritati se foloseste in reactia cu 1,95g potasiu? Ce volum de hidrogen se degaja la 800 mmHg si 27 grade Celsius?

Răspuns :

H3C-COOH + K => H3C-COOK + 1/2H2

n K = 1,95/39 = 0,05 moli

nK = n acid pur = 0,05 moli

m acid pur = 0,05*60 = 3g
m acid impur = 3*100/80 = 3,75g

n H2 = 0,5*nK = 0,5*0,05 = 0,025 moli

p = 800/760 = 1,052 atm

pV=nRT => V= nRT/p = 0,58425L H2