Acalorimeter contains 500 g of water at 25°c. you place a hand warmer containing 100 g of liquid sodium acetate (naac) inside the calorimeter. when the sodium acetate finishes crystallizing, the temperature of the water inside the calorimeter is 32.2°c. the specific heat of water is
4.18 j/g-°c. what is the enthalpy of fusion (δhf) of the sodium acetate? show your work.
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Ответ:
Q = 500 (4.18) (32.2 - 25)
Q = 15048 J
The enthalpy of fusion of the sodium acetate is:
ΔHf = Q / m
ΔHf = 15048 / 100
ΔHf = 150.48 J/g
Ответ:
The enthalpy of fusion
of the sodium acetate is 12.344 kJ/mol.
Explanation:
Heat absorbed by the water: Q
Change in temperature of water,![\Delta T=32.2^oC-25^oC=7.2^oC](/tpl/images/0331/2444/77531.png)
Specific heat of water = 4.18 J/g°C
Mass of water = m= 500 g
When 200 g of sodium acetate crystallizes it gave 15,048 Joules of heat which was absorbed by the water in calorimeter.
Moles of NaAC=![\frac{100 g}{82.03 g.mol}=1.2190 mol](/tpl/images/0331/2444/a936b.png)
The enthalpy of fusion
of the sodium acetate is 12.344 kJ/mol.
Ответ:
1). D. More heat is given off than is put into the reaction.
"An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy."
Hope this helps.