help on 3,4,5 please Novene 6, 207 1. Under constant conditions, the half-life o
ID: 554988 • Letter: H
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help on 3,4,5 please
Novene 6, 207 1. Under constant conditions, the half-life of a first order reaction- l-i (b) Is cof stane ecessary for the reactant concentration to drop to half is orial vals (c) Can be calculated froen the rate constant d)Does not depend on initial reactant concentration CAll of the above are correct reactant concentration so drop to half ies origloal valoe. 2. The minisums muamount of energy needed in oeder for a reaction to oocur is called o (a) potential energy (b) kinetic energy activation energy ) none of these 3. The half-life of Co (a radioactive isotope used in naclear medicine) is 5.27 years What is the rate constant for the radioactive decay of this isotope?(Hm: radioactive decay is a first-order process; pay attention to units). (a) 3.65 years (b) 0.131 years (c) 0.258 years (d) 2.58 years (e) 0.131 years 4. Given the following rate law rate-A(Nolla the reaction orders are (a) two with respect to both reactants, and four overall (b) one with respect to both reactants, and two overall (c) two with respect to NO2 and one with respect to Cla, and three overall (d) one with respect to NO; and two with respect to Cla, and three overall (d) two with respect to NO2 and one with respect to Cla, and two overall If the following reaction is performed and the concentration of O: is fourd to be decreasing at a rate of 0.23 moles/L·s, at what rate is the concentration of H2O increasing 5. 2H2 (g) + O2(g)- 2H2O (g) (b) 0.053 moles/L s (c) 0.92 molesL s (a) 0.23 moles/L s (e) can't be determined (d) 0.46 moles/L s 6. Colligative properties depend upon (a) the identity of the solute the number of solute particlesExplanation / Answer
3)
we have:
Half life = 5.27 yr
use relation between rate constant and half life of 1st order reaction
k = (ln 2) / k
= 0.693/(half life)
= 0.693/(5.27)
= 0.131 yr-1
Answer: 0.131 yr-1
Answer: e
4)
power of NO2 is 1. SO, order of NO2 will be 1
power of Cl2 is 2. SO, order of Cl2 will be 2
over all order = sum of individual orders
= 1 + 2
= 3
Answer: d
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