The number of unpaired electrons in the outer subshell of a Cl atom is

Of the following elements, which has occupied d orbitals in its ground-state neutral atoms?

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?

C2  (Write your answers on your free response paper) Give the electron configurations in the requested formats A)  Se (orbital box diagram) B)  Cr (Spectroscopic Notation) C)  Pb (Noble Gas Shorthand)

Using the following thermochemical data, calculate ∆Hf° of Tm2O3(s). 2TmCl3(s) + 3H2O(l) –> Tm2O3(s) + 6HCl(g) ∆H° = 388.1 kJ/mol 2Tm(s) + 3Cl2(g) –> 2TmCl3(s) ∆H° = –1973.2 kJ/mol 4HCl(g) + O2(g) –> 2Cl2(g) + 2H2O(l) ∆H° = –202.4 kJ/mol

Fe has __________ that is (are) unpaired in its d orbitals.

Nitric acid, HNO3, was first prepared 1200 years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid to produce sodium bisulfate and collecting the vapors of HNO3 produced.  Calculate DH°rxn for this reaction.  ∆H°f[NaNO3(s)] = -467.8 kJ/mol; ∆H°f[NaHSO4(s)] = -1125.5 kJ/mol; ∆H°f[H2SO4(l)] = -814.0 kJ/mol; ∆H°f[HNO3(g)] = -135.1 kJ/mol.NaNO3(s)  +  H2SO4(l)  =>   NaHSO4(s) + HNO3(g)

What is the enthalpy change when 49.4 mL of 0.430 M sulfuric acid reacts with 23.3 mL of 0.309 M potassium hydroxide? H2SO4(aq) + 2KOH(aq) –> K2SO4(aq) + 2H2O(l) ∆H° = –111.6 kJ/mol

Of the following elements, which has the lowest first ionization energy?

When 0.236 mol of a weak base (A–) is reacted with excess HCl, 6.91 kJ of energy is released as heat. What is ∆H for this reaction per mole of A– consumed?