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Answer:
-1.78 V
Explanation:
There are several rules required to calculate the cell potential:
- given standard cell potential, we may reverse the equation: the products of a given reaction become our reactants, while reactants become our products in the reversed equation. For a reversed equation, we change the sign of the cell potential to the opposite sign;
- if we multiply the whole equation by some number, this doesn't influence the cell potential value. It only produces a different expression in the equilibrium constant.
That said, notice that the initial reaction with respect to the final reaction is:
- reversed: chromium(III) cation and chloride anion become our reactants as opposed to the products in the initial reaction, so we change the sign of the cell potential to a negative value of -1.78 V;
- each coefficient is multiplied by a fraction of
. It doesn't influence the value of the cell potential.
Thus, we have a cell of E = -1.78 V.
The characteristics of the graphic representation are to find the scales and make the best graphic, in the attachment we have the points plotted
The graphical representation is one of the best methods to see the relationships between groups of data and to be able to find the functional relationships between them.
In this case, it is requested to make a scatter plot where the measured temperature is placed on the x-axis and the heat on the y-axis.
In the attachment we can see a graph with the requested data, the most important part of finding these graphs is looking for the scales
x-axis
scale x =
y-axis
scale y =
In general, the paper is 20 x 30 cm, we select the shortest part as the x axis
scale x =
scale x = 1º
Let's find the scale on the axis and the maximum value is 54000 and the minimum value is 3800, as the minimum value is much less than the maximum value, let's set this value to zero
scale y =
scale y = 1800
To facilitate marking the values, we select a slightly larger scale,
Selected scale
scale y = 2000 \frac{j}{cm \ paper}
Let's mark the points.
From observing these graph we see;
- The relationships are linear
- For the same material the amount of heat necessary to reach the same temperature is proportional to the mass of the material
Using the characteristics of the graphical representation, it is possible to find the scales and make the best graph
Learn more here: brainly.com/question/12511806
0.73 M is the concentration of sulfuric acid that needed 47 mL of 0.39M potassium hydroxide solution to neutralize a 25 mL sample of the sulfuric acid solution.
Explanation:
Data given:
Volume of the base = 47 ml
molarity of the base= 0.39 M
volume of the acid = 25 ml
molarity of the acid =?
For titration reaction between acid and base, the volume or molarity of any of the base or acid can be determined. The formula used:
Macid X Vacid = Vbase x Mbase
Macid =
putting the values given in the rearranged equation above:
Macid =
= 0.73 M
The concentration of the sulphuric acid needed is 0.73 M.