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What is the pH of a solution that is [x] M in nitrous acid (HNO 2) and [y] M in potassium nitrite (KNO 2).  Ka= 4.50 × 10 -4.  Round your answer to 3 decimal place.

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) You must balance the equation showing your written work to receive credit.  Mg 2+(aq) + Li(s) → Mg(s) + Li +(aq)

Determine the identity of the daughter nuclide from the electron capture by Be.

Determine the cell notation for the redox reaction given below. Pb(s) + 2 Ag⁺(aq) → Pb2+(aq) + 2 Ag(s)

Determine the binding energy of an F-19 nucleus. The F-19 nucleus has a mass of 18.99840325 amu. A proton has a mass of 1.00728 amu, a neutron has a mass of 1.008665 amu, and 1 amu is equivalent to 931 MeV of energy.

Given the following rate law, how does the rate of reaction change if the concentration of Y is doubled? Rate = k [X][Y]2

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) Pb(s) + Br2(l) → Pb2+(aq) + 2 Br⁻(aq)Pb2+(aq) + 2 e⁻ → Pb(s) E° = -0.13 VBr2(l) + 2 e⁻ → 2 Br⁻(aq) E° = +1.07 V

Determine the identity of the daughter nuclide from the beta decay of C.

Determine the rate law and the value of k for the following reaction using the data provided.2 N2O5(g) → 4 NO2(g) + O2(g)[ N2O5]i (M)Initial Rate (M-1s-1)0.093​4.84 × 10-40.084​4.37 × 10-40.224​1.16 × 10-3

In which of the following processes does the substance become more orderly?