Which of the following is the best definition of hess' law?
a. heat evolved in a given...
Chemistry, 29.09.2019 08:30 whyyounodocter
Which of the following is the best definition of hess' law?
a. heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest.
b. the enthalpy of a process is the difference between the enthalpy of the products and the enthalpy of the reactants.
c. since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps.
d. at constant pressure the enthalpy change of a reaction is equal to the heat change of a reaction.
e. heat is always released by the decomposition of 1 mole of a compound into its constitute elements.
Answers: 1
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For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate,m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2
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Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
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