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Dafna11 [192]
3 years ago
12

18. Which metal is capable of forming more than one cation? Li Ba Al Sn

Chemistry
1 answer:
maw [93]3 years ago
3 0

Answer:

Li

Explanation:

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A calorimeter contains 22.0 mL of water at 14.0 ∘C . When 2.50 g of X (a substance with a molar mass of 82.0 g/mol ) is added, i
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The enthalpy change in the the reaction is -47.014 kJ/mol.

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X(s)+H_2O(l)\rightarrow X(aq)

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Mass of the water in calorimeter = m

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Heat released during the reaction be Q

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Specific heat of the solution is equal to that of water :

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Q=Mc\times \Delta T

Q=24.50 g\times 4.18 J/g ^oC\times 14.0^oC=1,433.74 J=1.433 kJ

Heat released during the reaction is equal to the heat absorbed by the water or solution.

Heat released during the reaction =-1.433 kJ

Moles of substance X= \frac{2.50 g}{82.0 g/mol}=0.03048 mol

The enthalpy change, ΔH, for this reaction per mole of X:

\Delta H=\frac{-1.433 kJ}{0.03048 mol}=-47.014 kJ/mol

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