Wben a solid dissolves in wanec, beat may be evolved or abscebed. The heal of di

Question

Wben a solid dissolves in wanec, beat may be evolved or abscebed. The heal of dissolution (dissolvingi can be determined using a coffee cup calorimele Ia the laboratory a peneral chemiscy stodeat finds tho9.30 g of Nacios ace dissolved io 116.10 g of water, the emperatuce of the sobution drogs from 24.41 to 2182 C esperiment to be Lás I c kmo Based on the stadeuts obiervation calcuilane the eathalpy of dissolio of NaCOs Asome the specific beat of tdhe solution is equal to the specific beat of wate

Explanation / Answer

Heat change = calorimeter constant * (t2 - t1) + Mass of water * specific heat of water * (t2 - t1)

q = 1.68 * ( 21.82 - 24.41) + 116.10 * 4.184 * ( 21.82 - 24.41)

q = - 1262.5 J

So, 1262.5 J (OR) 1.26 kJ of heat is abosrobed

Massof NaClO4 = 9.80 g.

Molar mass of NaClO4 = 122.5 g/mol

Moles of NaClO4 = mass / molar mass = 9.80 / 122.5 = 0.0800 mol

Enthalpy change of dissolutio = q / n = 1.26 / 0.08 = 15.8 kJ/mol

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