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)

Sulfur and fluorine react to form sulfur hexafluoride:

S(s)+3F2(g)→SF6(g)

Part A

If 50.0 g S is allowed to react as completely as possible with 105.0 g F2(g), what mass of the excess reactant is left?

If 50.0   is allowed to react as completely as possible with 105.0  , what mass of the excess reactant is left?

Five moles of monatomic ideal gas are contained at a pressure of 4 atm and a temperature of 250 K. 35400 J of heat are transferred to the gas. Then, the gas pressure is used to expand a piston, and the expanding gas does 1200 J of work against its surroundings. However, the piston is not perfectly insulated, and 600 J of heat is lost from the gas during the expansion. All processes are reversible. Calculate the final temperature of the gas.

A particular smoke detector contains 1.95 μCi of ²⁴¹Am, with a half-life of 458 years. The isotope is encased in a thin aluminum container. Calculate the mass of ²⁴¹Am in grams in the detector.

Express your answer numerically in grams.

1. (a) What functional groups are present in (i) PET, (ii) Nylon and (iii) adipoyl chloride ?
2. 2. These three functional groups in question 1(a) are part of a larger family of functional groups. What is that larger family ?
   3. C. The larger family of functional groups in question 1(b) typically undergo reactions of a common general mechanistic pathway. The hydrolysis of PETE and the formation of Nylon in this experiment are both examples of this. What is the name of type of mechanism ?
3. 2- Industrially, nylon-6,6 is made by heating a diamine with a dicarboxylic acid. In a laboratory setting, it is difficult to make nylon using this method due to the formation of another product. Provide an equation to show this reaction.
4. 3- Polyesters can be made using the acid catalysed reaction of carboxylic acids and alcohols. Draw the curly arrow mechanism for this reaction by showing how methanoic acid and ethanol react to give ethyl methanoate.