26. In the reaction represented above, the number of Mno ions that react must be

Question

26. In the reaction represented above, the number of Mno ions that react must be equal to which of the following? (A) One-fifth the number of Fe2t ions that are consumed (B) Eight times the number of H ions that are consumed (C) Five times the number of Feions that are produced (D) One-half the number of H20 molecules that are produced 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0.000 0.200 0.400 0.600 0.800 1.000 1.200 27. A student prepared five solutions of Cuso4 with different concentrations, and then filled five cuvettes, each containing one of the solutions. The cuvettes were placed in a spectrophotometer set to the appropriate wavelength for maximum absorbance. The absorbance of each solution was measured and recorded. The student plotted absorbance versus concentration, as shown in the figure above. Which of the following is the most likely explanation for the variance of the data point for the 0.600 M CuSO4 solution? (A) The cuvette into which the 0.600 M solution was placed (B) The cuvette into which the 0.600 M solution was placed (C) The wavelength setting was accidentally moved away (D) The cuvette used for the 0.600 M solution had not been had some water droplets inside. was filled slightly more than the other cuvettes. from that of maximum absorbance. wiped clean before being put in the spectrophotometer

Explanation / Answer

26. The number of MnO4 ions must be equal to one fifth of the number of Fe+2 ions, the most suitable choice is letter A

in the reaction it is stated that 1 mole of MnO4 requires 5 moles of Fe+2

*one question at a time please =)

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