1.The standard cell potential (E°_cell) for the voltaic cell based on the reaction below is ______ V.

Sn²⁺(aq) + 2 Fe³⁺(aq) → 2 Fe²⁺(aq) + Sn⁴⁺(aq)

A.+0.62 B.+0.46 C.-0.46 D.+1.39 E.+1.21

2.Consider an electrochemical cell based on the reaction:

2 H⁺(aq) + Sn(s) → Sn²⁺(aq) + H₂(g)

Which of the following actions would change the measured cell potential?

A.increasing the pressure of hydrogen gas in the cathode compartment

B.increasing the pH in the cathode compartment

C.Any of these options will change the measured cell potential.

D.lowering the pH in the cathode compartment

E.increasing the [Sn²⁺] in the anode compartment

3.Which equation correctly represents the first ionisation of phosphorus?

4.On a phase diagram, the critical pressure is ______.

A.the pressure below which a substance is a solid at all temperatures

B.the pressure required to liquefy a gas at its critical temperature

C.the pressure required to melt a solid

D.the pressure above which a substance is a liquid at all temperatures

E.the pressure at which a liquid changes to a gas

What mass of potassium fluoride must be added to 500.0 mL of water to give a solution with pH = 8.07?

[K_a(HF) = 7.1 × 10^–4]

For each of the reactions, calculate the mass (in grams) of the product formed when 15.86 g of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant.

4Cr(s)+3O2(g)−−−−−→2Cr2O3(s)

M= g

2Sr(s)−−−−+O2(g)→2SrO(s)   

M= g

Calculate the mean repeat unit molar mass for a sample of poly[ethylene-stat-(vinyl acetate)]that comprises 12.9 weight percentage (wt%) vinyl acetate repeat units. Given that its number-average molar mass is 39.870 g mol. calculate the number-average degree of polymerization of the copolymer.

Answer: mean repeat unit molar mass of the copolymer = 30.67 and the number-average degree of polymerization of the copolymer =1300

Metallic vanadium, V, can be obtained from its oxide from the reaction below.

V₂O₅(s) + 5Ca(l) = 2V (s) + 5CaO(s)

If 100. g of V₂O₅ is reacted with 500.0 g of Ca, how many grams of V can be produced?

Consider the following reaction

A(aq) <=> 2B(aq) Kc= 9.07x10^-6 at 500K

If a 4.90 M sample of A is heated to 500 K, what is the concentration of B at equilibrium?

1.) An old vial of radioactivee material was found buried in the ground at Hanford Site. in 2014, it was found to contain 0.1578 Ci of 238Pu and 0.1125 Ci of 234U. the vial was labebled year 1951. how many atoms of 238 Pu and 234U were present in the vial in 1951 ?

238 94U a (t1/2)=87.72 y -> 23492U a (t1/2)=2.455*10^5 y ->23090TTh

If ?H = -60.0kJ and ?S = -0.300kJ/K , the reaction is spontaneous below a certain temperature. Calculate that temperature.

At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, K_c.

3A(g)+2B(g)−⇀↽−4C(g)Kc=2.53×1031

If, at this temperature, 1.70 mol of A and 3.50 mol of B are placed in a 1.00 L container, what are the concentrations of A, B, and C at equilibrium?

[A]=

[B]=

[C]=

Kp for the decompositions of ammonium hydrogren sulfide is 1.8 x 10^-4 at 25 degrees celcius.

NH₄HS (g) <--> NH₃ (g) + H₂S (g)

When 0.020 atm NH₄HS is placed in a flask and allowed to come to equilibrium, what are the consentrations NH₃ (g) and H₂S (g)?

Please show ICE table and how how quadratic equation is used. Thanks.

Why is the spectrum of He⁺ resembles that of Hydrogen?

lol

For these elements PCl3, H2O2, CH2O, N2, CO2, O3, NO3-, NO2, PCl, SiF6^-2, SF4, I3-, IF5, XeF4, H3O+. Give the following:

available Electrons (AE),

Needed Electrons (NE),

Geometry Description,

Number of sigma bonds,

Number of pi bonds

A solution is made using 16.5 percent by mass CH₂Cl₂ in CHCl₃. At 30 °C, the vapor pressure of pure CH₂Cl₂ is 490 mm Hg, and the vapor pressure of pure CHCl₃ is 260 mm Hg. The normal boiling point of CHCl₃ is 61.7 °C.

A. What is the mole fraction of CH₂Cl₂ in the solution?

B.what is the vapor pressure of the solution

C. what is the molarity of CH2Cl2 in solution

D. what is the boiling point of the solution? (Kb for CHCl3 is 3.67 C/m)