In the combustion of methane, indicate the substance that is oxidized and the su

Question

In the combustion of methane, indicate the substance that is oxidized and the substance that is reduced. 2. CH4 + 202CO2+2 H2o Determine the total number of electrons transferred in this reaction. 3. Consider the first order reaction, C-products. What is the integrated rate law for this reaction? a) b) If the concentration [C] is measured as a function of time, how can the rate constant for this reaction be determined? If the absorbance of light, A, is measured as a function of time, how can the rate con- stant for this reaction be determined? c) 4. In this experiment ethanol, CH3CH2OH, is oxidized by chromic acid, H2CrO4 Potassium dichromate, KCr20, (aq) reacts with sulfuric acid, H2SO4 (aq) to produce chromic acid H2CrO4 (aq) according to the following reaction. a) 2H30+ (aq) + Cr2072-(aq) ? 2 H2Cro, (aq) + H2O (l) The chromic acid H2Cro, (aq) is made by adding 1.00 mL of 0.0196 M potassium dichromate, KCr20, (aq), to 10.0 mL of 3.9 M sulfuric acid, H2SO4 (aq). Calculate the concentration of the chromic acid. 10.0 uL of CH;CH2OH is added to 2.00 mL of H2Cro4 (aq). Calculate the concentration of CH3CH2OH in the resulting solution given that the density of ethanol is 0.789 g/mL b) c) Ethanol is oxidized by the chromic acid according to the following reaction. 6 HO+ (aq) +3 CH,CH20H (a) + 2 H2CrO, (aq)3 CH,CHO (a)2C (a)+14 H,o0) Calculate the concentration of ethanol after reaction goes to completion and the percent change in the concentration of ethanol.

Explanation / Answer

Ans 2

Combustion of methane

CH4 + 2 O2 = CO2 + 2H2O

Oxidation number of H in CH4 = +1

Oxidation number of C in CH4

X + 4(+1) = 0

X = - 4

Oxidation number of O in CO2 = - 2

Oxidation number of C in CO2

X + 2(-2) = 0

X = +4

Carbon is being oxidized from - 4 to +4

Oxygen is being reduced from 0 to - 2

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