× CH21-Nuclear Cemistry X 021-Nuclear Chemistry CH1810-CH 14-Gnetics l × CH1810-
ID: 591543 • Letter: #
Question
× CH21-Nuclear Cemistry X 021-Nuclear Chemistry CH1810-CH 14-Gnetics l × CH1810-CH14-Kinetics li ' -a ah3pol state profkatz com/courses/wp-content/uploads/ 2017/11/CH1810 PrEx-4-Fa2017 +120% 10. The combustion of ethylene proceeds by the reaction C2H4(g)+302 (g2C02(2)+2H20G) When the rate of disappearance of 02 is 0.28 M s-1, the rate of appearance of CO2 is M s-l A) 0.19 B) 0.093 C)0.84 D) 0.42 E) 0.56 11. Determine the identity of the daughter nuclide from the alpha decay of 222Rn. 86 A)218 Po 84 226 224 C) 90Th 223 221 E) ss At 5 6 8 WEExplanation / Answer
10) The combustion of ethylene proceeds by the following reaction ---
C2H4 (g) + 3O2 (g) -------> 2CO2 (g) + 2H2O (g)
From the equation we can see that the mol ratio of O2 and CO2 = 3:2
For every mol of O2 that disappears, 2/3 mol CO2 is produced.
Therefore,
a rate of 0.28 Ms-1 of O2 disappearing corresponds to a rate of production of CO2
=0.28 Ms-1 * 2/3
= 0.1876 Ms-1 = 0.19 Ms-1
The answer will be A) 0.19 Ms-1.
11) The alpha decay of 22286Rn
22286Rn -----> 21884Po + 42He ( alpha decay)
The answer will be -- A) 21884Po
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