Chemistry, 25.03.2020 18:32 sarasaraparl4607
Consider the following reaction, for which ∆H° = +87.9 kJ/mol and ∆S° = +170.2 J/mol·K. PCl5(g) → PCl3(g) + Cl2(g) Assume ∆H° and ∆S° do not vary appreciably with change in temperature. At what temperature will the reaction be at equilibrium when the partial pressures of each component of the reaction are under standard conditions (1.00 atm each).?
Answers: 1
Chemistry, 21.06.2019 23:30
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Chemistry, 22.06.2019 11:40
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
Chemistry, 22.06.2019 20:00
The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.
Answers: 3
Consider the following reaction, for which ∆H° = +87.9 kJ/mol and ∆S° = +170.2 J/mol·K. PCl5(g) → PC...
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