Senin, 12 April 2021

Chemistry Chapter 5 Flashcards | Quizlet

zack April 12, 2021 No comments

- There is by convention 1 mol of product made. This means we eliminate reactions with more than one mole of compound formed. This eliminates reaction 5. - The lements haveto be in their state at room temperature. Fluorine is a gas, not a liquid, at room temperature ans pressure, so 2 is not a correct answer.ΔH for a reaction is equal to the sum of the heats of formation of the product compounds minus the sum of the heats of formation of the reactant compounds: ΔHrxn = Σ ΔHf products - Σ ΔHf reactants. The ∆Hf for a free element in its state a standard conditions will always equal 0 kJ. Let us take case by case) Consider the following two reactions: A → 2B ΔH°rxn = 456.7 kJ/mol A → C ΔH°rxn = -22.1 kJ/mol Determine the enthalpy change for the process:1.Enthalpy is an extensive property. 2.delta H for a reaction in the forward direction is equal in size, but opposite in sign, to H for the reverse reaction. 3.delta H for a reaction depends on the state of the products and the state of the reactants.17. (a) The heat of combustion of CH 4 (g) is -495.0 kJ mole-1.Calculate the mass equivalent of this energy in grams. (b) When 14 C decays to 14 7 N + 0-1 e, a mass loss of 0.000168 amu occurs. How many moles of CH 4 (g) would have to be burned to produce the same amount of energy as would be produced from the decay of 1 mole of 14 C?. 18. When two 1 1 H nuclei and two neutrons combine to form

For which one of the following reactions is ΔH°rxn equal

For which one of the following reactions is the value of Delta H°rxn equal to Delta H°f for the product? A) 2C (s,graphite) + 2H2 (g) -> C2H4 (g) B) H2 (g) + O2 (g) -> H2O2 (l) C) H2 (g) + 1/2 O2 (g) -> H2O (l) D) 1/2 N2 (g) + O2 (g) -> NO2 (g) E) All of the aboveThe following reactions is ΔH∘rxn equal to ΔH∘f of the product(s) : option a, b and d Further explanation The change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation . The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)For which one of the following reactions is the value of H°rxn equal to H°f for the product? Group of answer choices. A. H2 (g) + 1/2 O2 (g) H2O (l)Answer to For which one of the following reactions is ΔH°rxn equal to the heat of formation of the product? A) N2 (g) + 3H2 (g)

Enthalpies of Formation Quiz Flashcards | Quizlet

It can't be A), B), or E) since you make 2 moles of product and not just one. It seems to me that both C) and D) are viable. In C), the reactants (H2O(l) and O2(g) are in their standard states at 25 C and 1 atm P and thus have ΔH°f values of zero. Also, there is one mole of product (H2O2(l)) which is also in its standard state.Without giving the mol of product how can i calculate the Kp. Can anybody help me what to do to calculate the Kp. Here is the question im unable to . Chemistry. I had to perform an experiment using a coffee-cup calorimeter to determine the enthalpies of two separate reactions. For part 1 we worked with magnesium metal, and magnesium oxide.Our videos prepare you to succeed in your college classes. Let us help you simplify your studying. If you are having trouble with Chemistry, Organic, Physics, Calculus, or Statistics, we got your back! Our videos will help you understand concepts, solve your homework, and do great on your exams.As mentioned, there is by convention #"1 mol"# of product made. So we can eliminate #(1)# and #(5)# immediately. They must also use elements in their elemental state, and chlorine is a gas.____ 24. Of the following, which one is a state function? ￹ a. H ￻ ￹ b. q ￻ ￹ c. w ￻ ￹ d. heat ￻ ￹ e. none of the above ￻ ____ 25. For which one of the following reactions is the value of DH°rxn equal to DHf° for the product? ￹ a. 2Ca (s) + O2 (g) ® 2CaO (s) ￻ ￹ b. C2H2 (g) + H2 (g) ® C2H4 (g) ￻ ￹ c. 2C

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