mountassarhajar2008
10.10.2019 •
Chemistry
In a constant‑pressure calorimeter, 50.0 ml50.0 ml of 0.330 m0.330 m ba(oh)2ba(oh)2 was added to 50.0 ml50.0 ml of 0.660 m0.660 m hcl.hcl. the reaction caused the temperature of the solution to rise from 23.66 ∘c23.66 ∘c to 28.16 ∘c.28.16 ∘c. if the solution has the same density and specific heat as water, what is heat absorbed by the solution? assume that the total volume is the sum of the individual volumes. (and notice that the answer is in kj).
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Ответ:
0.075881 kJ
Explanation:
The balanced equation for the reaction between
The enthalpy represents the energy that is either absorbed or released during a chemical reaction. It can be estimated experimentally using a calorimeter to measure the change in temperature after the reaction has occurred. The endpoint of the reaction is determined when there is no change in the temperature in the calorimeter.
With the data, we can use the next equation to estimate the heat (enthalpy) absorbed in this reaction.
Where
Q is heat, m is mass of the reactants and Cp is the specific heat of the products and delta T is the change of temperature.
Mass of the reactants.
We know that molarity is
So
We can estimate the moles for each reactant as:
The molecular mass for each reactant is:
The mass for each one is
Total mass = 1.2012 g + 2.83 g = 4.0283 g
Cp is the one for the water
Delta T = 28.16 °C - 23.66 °C = 4.5 °C
Using the equation
The heat absorbed in this reaction is 75.88 J or 0.075881 kJ
Ответ:
I hope this helps.