1. How many grams of Kr are in a 9.76 L cylinder at 75.6 ∘C and 9.27 atm?

mass: ? g

2. If 2.44 g Ar are added to 2.38 atm He in a 2.00 L cylinder at 27.0 °C, what is the total pressure of the resulting gaseous mixture?

= ? atm

Please help would greatly appreciate it..Thank you so much.

1.A 25.0 L solution is made of 0.10 M acid and 0.13 M conjugate base. What mass of HNO₃ (MM = 63.01) in grams can the buffer absorb before one of the components is no longer present?

2. If 147 g of ZnF2 (Ksp=0.0300) is added to water to make a 1.00 L to the solution, what is the [F^​-​] concentration in the solution in molarity?

3. A solution begins with .100M of NaF dissolved in water. What is the concentration of Magnesium ion in the solution, if MgF2 was added in excess? Ksp (MgF2)= 5.2*10^-11

3) The emission spetrum from stars can be used to determine their temperature ( they are blackbody emitters). our sun has a temperature of 5800 k.

a) use the wavelenght maximum equation to determine the wavelenght maximum for the sun ( in nanometers).

b) The star Bellatrix (in the orion constellation)has a temperature of 27,000k.

What is the wavelenght corresponding to the maximum intensity of the emisson from Bellatrix?

All academic manuscripts (journal articles, communications, etc.) have an introduction as a way to introduce the reader to the scientific problem that the paper addresses and describe the purpose of the experiment and also what has been done by others to give the reader some context. Write a 200-400 word introduction to nucleophilic acyl substitution reactions. You should find two recent (within the last three years) examples of nucleophilic acyl substitution reactions in journals and introduce those articles in your introduction.

Garnet typically has the chemical formula: (Fe2+, Mg2+, Ca 2+, Mn2+)3 Al3+2Si4+3O12

The formula can be broken up into structural sites (spaces where cations of a certain size range can occupy) X3Y2Z3O12 where the X-site is coordinated with 8 oxygen anions, the Y-site is coordinated with 6 oxygen anions, and the Z-site is coordinated with 4 oxygen anions. Using the table of ionic radii, calculate the predicted coordination number (CN) relative to O2- for each cation in the garnet formula. How do the calculated CNs compare to those for real garnet? Explain why they are the same or different.

When ethanol, C2H5OH (a component in some gasoline mixtures) is burned in air, one molecule of ethanol combines with three oxygen molecules to form two CO2 molecules and three H2O molecules.

a)     Draw two molecular-sized models: one for the reactant mixture and one the product mixture! Use different colors or different shading to indicate the identity of the atoms.

b)     Write the balanced chemical equation for the reaction described.

c)     How many molecules of CO₂ and H2O would be produced when 2 molecules ethanol are consumed? Equation?

d)     How many H2O molecules are formed, then 9 O2 molecules are consumed? What conversion factor did you use? Explain!

e)     If 15 ethanol molecules react, how many molecules O2 must also react? What conversion factor did you use? Explain!

You are given 10.00mL of a solution of an unknown acid. The pH of this solution is exactly 5.62. You determine that the concentration of the unknown acid was 0.1224 M. You also determined that the acid was monoprotoic (HA). What is the K_a and pK_a of your unknown acid?

Consider the unbalanced reaction between silver nitrate and sodium chromate:

AgNO₃(aq) + Na₂CrO₄(aq) → Ag₂CrO_4(s) + NaNO₃(aq)

Using the information from above, determine the concentration of the nitrate ions left in solution after the reaction is complete.

Using the information from above, determine the concentration of the chromate ions left in solution after the reaction is complete.

The elements radium and astatine both arise during the radioactive decay of uranium. They get together in the form of the salt RaAt2; the radius of the Ra2+ ion is 162 pm and the radius of the At- ion is 226 pm. (a) Predict the coordination number of Ra and At as well as the type of lattice that RaAt2 will adopt. (b) Calculate the lattice energy of RaAt2.

A lead-acid battery uses a redox reaction in which lead(0) and lead(IV) are both converted to lead(II). This reaction is facilitated by the presence of sulfuric acid, H2SO4, as shown by the reaction

Pb+PbO2+2H2SO4→2PbSO4+2H2O

Suppose that a fully charged lead-acid battery contains 1.50 L of 5.00 M H2SO4. What will be the concentration of H2SO4 in the battery after 3.30 A of current is drawn from the battery for 7.50 hours?

Express your answer with the appropriate units.

A student carried out the experiment "Ways to Express Concentration" and obtained the following data expressed in the table.
used solute and molar mass: NaCl (58.44 g / mol)
volume and concentration aqueous solution originally prepared: 500.00mL 2.50M
Empty tube mass: 147.85g
Tube mass with solution: 150.95g
Tube mass with residue: 149.03g
volume of solution used: 2.000mL
1. Residual mass?
2. Mass solution?
3. Solvent mass?
4. Moles of solute?
5. Moles solvent?
6. The calculated molarity of the solution is:
7. The molar fraction of the solvent is:
8. The percent by mass of solute is:
9. What are the colligative properties?
10. What were the substances used in the "Descent in Melting Point" experiment?
11. How is molar mass determined from data from a melting / freezing drop experiment?

What other organic compounds do you encounter in your everyday life that have a 1) positive effect and 2) negative effect. Explain in great detail how these organic compounds affect your lifestyle.

Double checking if the answer is E

Which of the following has the particles ordered correctly from smallest to largest radius?

A. Ca < K < Mg < Mg²⁺

^B. Mg < Mg²⁺ < Ca < K

C. Ca < K < Mg²⁺ < Mg

D. K < Ca < Mg²⁺ < Mg

E. Mg²⁺ < Mg < Ca < K