Calculate the mass (in  g) of each sample.

6.31×10²⁰ SO3 molecules​

2.4×10²² H2O molecules​

4.6×10²⁵ O3 molecules​

9.85×10¹⁹ CCl2F2 molecules​

drawing a Lewis structure of compound, what are some ways that I can determine if it's polar or nonpolar?

Without calculating the electronegative difference, how can I look at a structure and determine if it's polar or nonpolar?

If given the spectra for 2-Heptanone and Heptanal, how could you tell which is which?

If given the spectra for 2-Heptanone and Heptanoic Acid, how could you tell which is which?

If given the spectra for Tetrahydrofuran and 2-heptanol, how could you tell which is which?

If given the spectra for tetrahydrofuran and ethyl pentanoate, how couldm you tell which is which?

Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O . Suppose 0.36 g of hydrochloric acid is mixed with 0.164 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

Assignment due soon! Please hurry! Aaaaah!!

You have created a galvanic cell in order to perform the following UNBALANCED reaction. First, balance the reaction. Br- + Ag+ → Br2 + Ag

Part 1: You look up the appropriate reduction potentials for this reaction, and you find the following: Half Reaction Eo (V) Br2 + 2e- → 2Br- 1.11 Ag+ + e- → Ag 0.77 What is the voltage of the reaction given in the introduction? Br- + Ag+ → Br2 + Ag

Part 2: We will use this voltage to calculate K and ΔGo. From your balanced reaction, what number will you use for n?

Part 3: In order to calculate K from ΔG, we must select the appropriate value of R. The question, then, is what units will ΔGo have after the calculation. Note that Faraday's constant (F) has a value of 96500 C/mol, E has units of V, n has units of moles, and 1 V = 1 J/C. Which of the following is the correct value for R? A 0.00831 kJ/(mol*K) B 0.0821 L*atm/(mol*K) C 8.31 J/(mol*K)

Part 4: What is the value of ΔGo for the reaction determined in part 1 (in J/mol)?

Part 5: If the above reaction is carried out at 298 K, what is the value of K?

Calculate the pH of buffers based on the recipes

A: 17.91g Na₂HPO₄*12H₂O

1.7mL 1M NaOH

998.3mL H₂O

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B: 13.16g citric acid monohydrate

25mL 1M NaOH

998.3mL H₂O

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C: 0.49g NaH₂PO₄*H₂O

12.49g Na₂HPO₄*12H₂O

1L H₂O

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D: 17.91g NaH₂PO₄*12H₂O

1L H₂O

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4) The equilibrium constant for the reaction shown below is 4.63 x 10^-3 at 527^oC.

                        COCl₂(g) ó CO(g) + Cl₂(g)

a)Write the equilibrium constant expression in terms of the chemical concentrations.

b)What is the equilibrium constant for the reverse reaction?

c)If 0.50 mol of COCl₂ is placed in a 2.0 L flask, what will the concentration of all of the reactants and products be when the reaction reaches equilibrium at 527^oC?

A desert experiences much wider daily temperature variations than does a humid environment. Explain why this occurs.

Please answer in atleast 1 paragraph...

1. Please explain the principle of affinity chromatography and then provide many (two or three) specific examples.

2. Describe the difference b/t step-gradient and the linear gradient. What are the advantages and the disadvantages in each?

8.81) How many moles of a gas will occupy a volume of 0.61 L at a temperature of 331 K and a pressure of 3.0 atm ?

8.112) Part A. When fully inflated, a hot-air balloon has a volume of 1.6×105L at an average temperature of 395 K and 0.967 atm . Assuming that air has an average molar mass of 29 g/mol, what is the density of the air in the hot-air balloon?

Part B) How does this compare with the density of air at STP? It's less dense than at STP. It's more dense than at STP.

I) Approximately 10 g of iron filings has been placed into a waste container of approximately 2L of 6M HCl.

1. Assuming 1 mole of H2 evolved will have the volume of 22.4L, how many liters of hydrogen gas will have been produced if the reaction forming hydrogen gas and iron (III) chloride were to go to completion? (Show calculations) (5 pts)

2. What are some of the hazards of this reaction? (5 pts)

3. What minimum container size would be necessary to fully neutralize the acid solution using 3M NaOH? Assume none of the hydrochloric acid has yet reacted. (Show calculations) (5 pts)

Calculate the molar absorptivity of crystal violet using the absorbance value of the crystal violet solution determined in the lab and Beer’s law. How does this value compare with the value of 87,000 M^-1 cm^-1 at 590 nm reported in literature?

Absorbance value used in lab: 590 nm.

If not enough information to solve, please explain how I would go about solving this.

A cylinder with a movable piston is filled at 24^oC with a gas that occupies 36.2cm³. If the maximum capacity of the cylinder is 65.2cm³, what is the highest temperature to which the cylinder can be heated at constant pressure without having the piston come out?

A 125.0 −mL sample of a solution that is 2.8×10⁻³ M in AgNO3 is mixed with a 220.0 −mL sample of a solution that is 0.10 M in NaCN . After the solution reaches equilibrium, what concentration of Ag+(aq) remains?

I have tried different ways and come up with these answers, all incorrect:

[Ag+] = 5.5e-15 M

[Ag+] = 1.9e-15 M

[Ag+] = 1.3e-22 M

Please show work.

Calculate the E^ocell for: Fe(s) + Br₂(g) →   Fe²⁺(aq) +Br^-(aq) ; is this electrolytic or voltaic?