1. Write chemical equations for the following reac- tions: (a) CoCl2·6H2O + H20,
ID: 926412 • Letter: 1
Question
1. Write chemical equations for the following reac- tions: (a) CoCl2·6H2O + H20, t NH4OH + NH.;Cl+ 3. In the calculation of the percent yield for the unknown compound, why were the masses of all materials used in the reaction ignored with the exception of the mass of CoCl2 ·6H2O? (unknown compound)+ H2O (b) (unknown compound) + Ag+ heat (c) (unknown compound)- CoCl2 + 4. Evaluate the proportionality constant for Beer's law 2. Calculate the average deviation in the percent chlorine determinations. The average deviation is defined by the formula Ans. iters mole where indicates a summation of the terms for all values of i, X is the average value of all measurements, xj is the value of the ith measurement, and n is the total number of measurements 5. In the preparation of the unknown compound 1 g of powdered charcoal was used as a catalyst for the reaction. What is the purpose of a catalyst in a chemical reaction?Explanation / Answer
2. The average deviation is one of several indices of variability that statisticians use to characterize the dispersion among the measures in a given population.
To calculate the average deviation of a set of scores it is first necessary to compute their mean and then specify the distance between each score and that mean without regard to whether the score is above or below the mean. The average deviation is defined as the mean of these absolute values.
4.
The absorbance of a transition depends on two external assumptions.
Mathematically, Beer’s Law can be stated as: A = abc where “a” is the molar absorptivity, “b” is the pathlength, “c” is the concentration, and “A” is absorbance. Molar absorptivity, a, is a proportionality constant that has a specific value for each absorbing species at a given wavelength. The pathlength, b, is the distance across the solution in centimeters and is dependent upon the size of the cuvette. In this case, the pathlength will be kept constant at 1.00 cm. The concentration, c, of the absorbing species is in moles of solute per liter of solution.
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