Calculate the hydronium ion concentration and the pH at the equivalence point when 65.0 mL of 0.4000 M NH3 is mixed with 35.0 mL of 0.7429 M HCl.

Ka=5.6x10-10

Balance the following using the ½ reaction method Permanganate ion plus bromide ion yields (MnO4) and BrO3 - (basic solution)

Describe the process for determining the orbital diagram for an atom, including the number of orbitals and electrons for each subshell. Describe how quantum numbers relate to the orbital diagrams. How does this quantum mechanical view of the atom differ from the Bohr model of the atom?

Part A Suppose that the microwave radiation has a wavelength of 11.6 cm . How many photons are required to heat 275 mL of coffee from 25.0 ∘C to 62.0 ∘C? Assume that the coffee has the same density, 0.997 g/mL , and specific heat capacity, 4.184 J/(g⋅K) , as water over this temperature range.

Express the number of photons numerically.

l

A solution is made by dissolving 0.0500 mol of HF in 1.00 kg of water. The solution was found to freeze at -0.104C. Calculate the percent dissociation of HF in this solution.

Determine the energy of 2.00 mol of photons for each of the following kinds of light. (Assume three significant figures.)

Infrared radiation (1590nm)

Visible light (500nm)

UV radiation (150nm)

How do aqueous solutions of ionic and molecular compounds differ?

Balance these equations for reactions occurring in an acidic solution:

(a) NO₃^–  + Zn --> NH₄⁺ + Zn²⁺

(b) Cr³⁺ + BiO₃^– --> Cr₂O₇^2– + Bi³⁺

(c) I₂ + OCl^– --> IO₃^–  + Cl^–

(d) Mn²⁺ + BiO₃^– --> MnO₄^– + Bi³⁺

What mass (in grams) of nitrogen must be added to 8.34 g of argon at 24.17oC, and in a 126.1 L contain for a final pressure of 895 mmHg?

What is the mole fraction of O2 in a mixture of 15.1 g of O2, 8.19 g of N2, and 2.47 g of H2?

What is the mole fraction of N2 in a mixture of 15.1 g of O2, 8.19 g of N2, and 2.47 g of H2?

What is the mole fraction of H2 in a mixture of 15.1 g of O2, 8.19 g of N2, and 2.47 g of H2?

What is the partial pressure in atm of O2 of this mixture if it is held in a 15.20 −L vessel at 15 ∘C?

Which of the following would result as a buffer if any when 1 L of each is mixed together:

a) 0.1 M KOH and 0.2 NH₄Cl

b) 0.2 M HNO₃ and 0.6 M NaNO₃

Please Explain!

The average human body contains 5.70 L of blood with a Fe2+ concentration of 3.20×10−5 M . If a person ingests 7.00 mL of 24.0 mM NaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion?