For ethane, P_c = 48.2 atm and Tc = 305.4 K. Calculate the pressure exerted by 50.0 g of C₂H₆ in a 200-cm³ vessel at 37.5°C.

(c) the Redlich–Kwong equation; (d) the virial equation, given that for ethane B = -179 cm³/mol and C = 10400 cm⁶/mol² at 30°C, and B = -157 cm³/mol and C = 9650 cm⁶/mol² at 50°C.

(c) P = ? atm

(d) P = ? atm

How much heat in kilojoules is required to warm 10.0 g of ice, initially at -20.0 ∘C, to steam at 105 ∘C. The heat capacity of ice is 2.09 J/g∘C and that of steam is 1.84 J/g∘C.

Need help solving it.

I got 30.603, but I do not if it is right.

Use the density and molecular weight of limonene, linalool, and nonane to calculate the volumes of the compounds you will need to make the stock solution of 50 nM. Also calculate the final concentration of those solutions after dilution.

Nonane: d = 0.718 g/mL, MW = 128.26, 99% pure

Limonene: d = 0.84 g/mL, MW = 136.24, 96% pure

Linalool: d = 0.861 g/mL, MW = 154.25, 97% pure.

1. Why does E. coli need both DNA polymerase III and DNA polymerase I?

a. The DNA replication is bidirectional; one polymerase is used for each direction.

b. Each polymerase is specific for only one strand of DNA. DNA polymerase III acts only on the leading strand, and DNA polymerase I acts only on the lagging strand.

c. Only DNA polymerase I has proofreading ability.

d. DNA polymerase III lacks the 5' → 3' exonuclease activity needed to remove RNA primers.

2. The replication of DNA is ________ because ________.

a. semiconservative; one strand of parental DNA is retained in each daughter DNA.

b. semiconservative; each daughter molecule has two new strands copied from the parental DNA template

c. conservative; each daughter molecule has two new strands copied from the parental DNA template.

d. conservative; one strand of parental DNA is retained in each daughter DNA.

3. Active transport proteins in biological membranes are

a. always transporting Ca2+ ions.

b. never driven by concentration gradients.

c. never driven by ATP to ADP conversion.

d. sometimes driven by concentration gradients.

4. Why should it not be surprising that for many cells water requires a protein for its transport across a membrane?

a. The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane.

b. Water is very polar which inhibits its free diffusion across the membrane.

c. All molecules require transport proteins to cross a membrane.

d. There is never a concentration gradient for water across the membrane to drive its transport.

5. The conversion of pyruvate to lactate in muscles also causes the ________.

a. reduction of NAD+.

b. oxidation of NAD+

c. oxidation of NADH

d. reduction of oxygen to water.

6. ATP is a cosubstrate of the enzyme PFK-1. In most species ATP is also an inhibitor of PFK-1 at higher concentrations. Which statement below would provide a suitable explanation?

a. PFK-1 must be phosphorylated by ATP in the active site and the phosphorylated PFK-1 must be the less active form.

b. There are two sites on PFK-1 that bind ATP. One is the active site; the other is the regulatory site where inhibition occurs allosterically.

c. ATP actually activates the reverse of the reaction preceding the PFK-1 step in the pathway. It likely has no direct effect on PFK-1.

d. There must be another cofactor interacting with ATP at high concentrations to achieve inhibition of PFK-1.

7. Briefly describe two ways for deactivation of GPCR-signaling.

100 mL of 0.1 M NaOH solution was poured into 20 mL of 0.2 M H2SO4 solution and mixed well. What was the final pH of the mixture?

Describe how to make 500mL 0.435 M HNO3 from a 6.00M HNO3 solution. (Titration Lab)

A 1.198 g sample contains only vitamin C (C6H8O6) and sucralose (C12H19Cl3O8). When the sample is dissolved in water to a total volume of 25.3 mL, the osmotic pressure of the solution is 5.62 atm at 303 K. What is the mass percent of vitamin C and sucralose in the sample?

vitamin C: %

sucralose: %

Give the wavelengths of maximum absorption for each solution as shown in the spectra provided. Use the absorption wavelengths to explain why the [Ni(H2O)6] 2+ solution appears yellow-green but the [Co(H2O)6] 2+ solution appears pink.

[Ni(H2O)6] 2+ maximum absorbance at 720 nm

[Co(H2O)6] 2+ maximum absorbance at 510 nm

Nitrogen is slightly less dense than is a sample of air at the same temperature and pressure. Calculate the density of N2 in g/L, at 1.45 atm at 15 degree Celsius

Propose a detailed sample preparation method for testing total sodium concentration in whole blood by Atomic emission

4a. For the following reaction, 3.96 grams of carbon tetrachloride are mixed with excess methane (CH₄) . The reaction yields 3.67 grams of dichloromethane (CH₂Cl₂) .
methane (CH₄) ( g ) + carbon tetrachloride ( g ) -------> dichloromethane (CH₂Cl₂) ( g )

4b. For the following reaction, 5.03 grams of silver nitrate are mixed with excess copper(II) chloride. The reaction yields 3.02 grams of silver chloride.
silver nitrate (aq) + copper(II) chloride (s) ----------> silver chloride (s) + copper(II) nitrate (aq)

4c. For the following reaction, 5.80 grams of silver nitrate are mixed with excess copper. The reaction yields 2.56 grams of copper(II) nitrate.
silver nitrate (aq) + copper (s) ---------> copper(II) nitrate (aq) + silver (s)

NH₄NO₃(s) <---> N₂O (g) + 2H₂O(g) K = 0.665 at 525K

If a 2L reaction vessel contains 0.65 moles of N₂O (g), 1.2 moles of 2H₂O (g) and 1.3 moles of NH₄NO₃ (s), which of the following statements are correct?

a. The amount of N₂O (g) will increase and K will not change

b. The amount of N₂O (g) will increase and K will get larger

Please explain!!!!!!!!!!!!!!!

If the volume of the container is decreased, where will the equilibrium shift?

An unsaturated fat that is liquid at room temperature, such as olive oil can react in the presence of Pd/C without a hydrogen source to form a solid fat of the same formula. Explain what process besides hydrogenation could be taking place.

3a. For the following reaction, 9.80 grams of carbon monoxide are allowed to react with 10.1 grams of water.
carbon monoxide (g) + water (l) carbon dioxide (g) + hydrogen (g)
What is the maximum amount of carbon dioxide that can be formed? _____ grams
What is the FORMULA for the limiting reagent? _____
What amount of the excess reagent remains after the reaction is complete? _____ grams

3b. For the following reaction, 8.18 grams of nitrogen gas are allowed to react with 5.92 grams of oxygen gas.
nitrogen (g) + oxygen (g) --------> nitrogen monoxide (g)
What is the maximum amount of nitrogen monoxide that can be formed? _____ grams

What amount of the excess reagent remains after the reaction is complete? _____ grams

3c. For the following reaction, 22.1 grams of iron are allowed to react with 46.7 grams of chlorine gas.

iron (s) + chlorine (g) -----> iron(III) chloride (s)

What is the maximum amount of iron(III) chloride that can be formed? _______ grams

What amount of the excess reagent remains after the reaction is complete? _______ grams