Kemi opgave Entalpi-tilvækst 1-3

Opgave 1

$LaTex: \frac{2.6 \frac{kJ}{K} \cdot 7.7 K }{0.9\cdot 0.520 g} = 42.78\frac{kJ}{g}\\ \frac{42.78\frac{kJ}{g} }{204.09\frac{g}{mol}} = 0.2096 \frac{kJ}{mol}$

Opgave 2

$LaTex: n_{CuSO_4} = 1,25\cdot 1 = 1,25 mol\\ n_{Zn} = \frac{50 g}{65.39 \frac{g}{mol}} = 0.765 mol\\ H^{\circ}_{CuSO_4} = -772,2\frac{kJ}{mol}\\ H^{\circ}_{Cu} = o \frac{kJ}{mol}\\ H^{\circ}_{Zn} = 0 \frac{kJ}{mol}\\ H^{\circ}_{ZnSO4} = -982,8 \frac{kJ}{mol}\\ \sum_{\text{produkter}} H^{\circ} = -982,8 \frac{kJ}{mol}\\ \sum_{\text{reaktanter}} H^{\circ} = -772,2 \frac{kJ}{mol}\\ \Delta H^{\circ} = \sum_{\text{produkter}} H^{\circ} -\sum_{\text{reaktanter}} H^{\circ} = -210,6 \frac{kJ}{mol}\\ Q = 210,6 \frac{kJ}{mol} \cdot n_{Zn} = -160,696 kJ\\ C_{vand} = 4,18 \frac{kJ}{kg\cdot K}\\ \Delta K = \frac{Q kJ}{4,18\frac{kJ}{K}} = 38,44 K$

Opgave 3

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Kategorier: Kemi Opgaver

Kemi opgave Entalpi-tilvækst 1-3

Opgave 1

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