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Consider the reaction:2ClF3(g) + 2NH3(g) –> N2(g) + 6HF(g) + Cl2(g)When calculating the ∆H°rxn, why is the ∆Hf° for N2 not important?

In which group do all the elements have the same number of valence electrons?

Controlled drinking approaches may be especially suited to individuals who have a

Of the following elements, which is most likely to form a negative ion with charge 1–?

Order the elements S, Cl, and F in terms of increasing ionization energy.

When a hydrogen electron makes a transition from n = 3 to n = 1, which of the following statements is true? I. Energy is emitted. II. Energy is absorbed. III. The electron loses energy. IV. The electron gains energy. V. The electron cannot make this transition.

Given the heats of the following reactions:     ∆H°(kJ) I. P4(s) + 6 Cl2(g) –> 4 PCl3(g) –1225.6 II. P4(s) + 5 O2(g) –> P4O10(s) –2967.3 III. PCl3(g) + Cl2(g) –> PCl5(g) –84.2 IV. PCl3(g) + O2(g) –> Cl3PO(g) –285.7 Calculate the value of ∆H° for the reaction below:          P4O10(s) + 6 PCl5(g) –> 10 Cl3PO(g)

C3  (Write your answers on your free response paper) Give the electron configurations in the requested formats A)  As (orbital box diagram) B)  Zn (Spectroscopic Notation) C)  Po (Noble Gas Shorthand)

Green light can have a wavelength of 543 nm. The energy of a photon of this light is

CH4(g) + 4Cl2(g) –> CCl4(g) + 4HCl(g), ∆H = –434 kJBased on the above reaction, what energy change occurs when 1.2 moles of methane (CH4) reacts?