Which one of the following has the lowest vapor pressure at 25 degrees celsius? a) CH3OH b) HOCH2CH2OH c) CH3OCH3 d) CH3CH2OH

During a Structure and Solubility experiment how do you distinguish between the following:

a.) butane and 2-chlorobutane

b.)butane and 1-butanol

c.)1-butanol and 2-butanol

d.)1-butanol and butanoic acid

Can somebody explain to me the miscibility of isopropanol alcohol and ethanol alcohol in a NaCl solution and why higher levels of concentration of salt solution make the alcohol less miscible (homogeneous)?

a)What is the mass (in grams) of the solid product when 7.5 g of silver nitrate reacts in solution with excess sodium carbonate?AgNO₃(aq) + Na₂CO₃(aq) --> Ag₂CO₃(s) + NaNO₃(aq) [unbalanced]

b)What is the mass (in grams) of the precipitate when 7.62 g of silver nitrate reacts in solution with excess sodium phosphate?AgNO₃(aq) + Na₃PO₄(aq) --> Ag₃PO₄(s) + NaNO₃(aq) [unbalanced]

Mutliple step synthesis for 4-bromoacetanilide from aniline

1. during the synthesis of aniline from nitrobenxe, explain why it was necessary to make the solution alkaline (addition of NaOH)

2. During filtration, why is it important to only wash the solid with ice-cold solvent?

3. Why is it necessary ti acylate aniline prior to bromination?

4. If the synthesis of p-bromoacetanilide also provided a small amount of o-bromoacetanilide after the crystallixation step, how would that influence the melting point range od p-bromoacetanilide?

Ethyl alcohol has a vapor pressure of 20.0mm Hg at 8.0 ° C and a normal boiling point of 78.4 ° C.Estimate the vapor pressure at 45 ° C using (a) the Antoine equation; (b) the Clausius – Clapeyronequation and the two given data points; and (c) linear interpolation between the two given points.Taking the fi rst estimate to be correct, calculate the percentage error associated with the secondand third estimates.

A gas cylinder contains 2.30 mol He, 1.35 mol Ne, and 1.75 mol Ar. If the total pressure in the cylinder is 2290 mmHg, what is the partial pressure of each of the components? Assume constant temperature.

P(He) = ?

P(Ne) = ?

P (Ar) = ?

A 10.00 mL sample of 0.150 M sodium azide, NaN3, a weak base, is titrated with 0.100 M HCl. Calculate the pH after the addition of the following volumes of acid:

(a) 0.00 mL; (b) 9.00 mL; (c) 15.00 mL; (d) 27.00 mL

The Ka of HN3 is 1.9 x 10–5

Assuming you use 2.5 g vanillin and 5.0 mL of a 3.42 M NaBH4 solution, what is the theoretical yield of vanillyl alcohol in moles? in grams?

How many mL of 12 M HCl will be needed to prepare 500 ml of 1.2 ppm HCl solution? What is the pH of this 1.2 ppm HCl solution? Using the right significant figures. MW of HCl=36.5g/mol

I already found the first answer which is 1.4 x 10^-3 mL

How do I find the pH? I know the formula is -log [H+], but I have no information for it?

A 0.5072 g solid sample containing a mixture of LaCl3 (molar mass = 245.26 g/mol) and Ce(NO3)3 (molar mass = 326.13 g/mol) was dissolved in water. The solution was titrated with KIO3, producing the precipitates La(IO3)3(s) and Ce(IO3)3(s). For the complete titration of both La3 and Ce3 , 44.01 mL of 0.1289 M KIO3 was required. Calculate the mass fraction of La and Ce in the sample.

calculate the molar mass? calculate the value of the freezing point depression constant, Kf, for acetic acid.

What mass of propane will occupy the same volume as 0.057 mol of butane at 1.00 atm and 298 K?

My answer: 0.057m x 0.0821Latm/Kmol x 298K = 1.4 L

Suppose a student performed a similar experiment using pentane and hexane as his gases.

Pentane Hexane

Molar Mass (g/mol) 72.15 86.18

Mass (g) 0.541 0.646

Given the data in the figure above, which gas will occupy a larger volume at STP? (This is the question I am stuck on.)

PART A: 137 nmol of an antibody that binds strongly to the antigen protein G is covalently bound to the support of an affinity column with a void volume of 1.95 mL. The association equilibrium constant (K_A) for the binding of protein G to the antibody is 5.19 × 10⁸ M^-1 at pH 7.2. Calculate the retention factor for protein G on this column at pH 7.2. k=?

PART B: At pH 7.2 and a flow rate of 1.00 mL/min, how many minutes would it take protein G to elute from this column? t_r=? min

PART C: If a pH 3.5 elution buffer is applied to the column, protein G elutes at 3.12 min using a flow rate of 1.00 mL/min. Under these conditions, what is the association equilibrium constant between protein G and the antibody? K_A=? M^-1