A sample of helium gas at a pressure of 772 torr and a temperature of 22.7 °C, occupies a volume of 814 mL. If the gas is allowed to expand at constant temperature until its pressure is 549 torr, the volume of the gas sample will be mL.
A sample of argon gas at a pressure of 697 torr and a temperature of 26.4 °C, occupies a volume of 448 mL. If the gas is compressed at constant temperature until its pressure is 858 torr, the volume of the gas sample will be mL.
A sample of hydrogen gas at a pressure of 0.521 atm and a temperature of 25.3°C, occupies a volume of 12.9liters. If the gas is allowed to expand at constant temperature to a volume of 22.1 liters, the pressure of the gas sample will be atm.
In: Chemistry
The vapor pressure of an organic solvent is 50mmHg at 25 C and
200mmHg at 45 C. The solvent is
the only species in a closed flask at 35 C and is present in both
liquid and vapor states. The volume
of gas above the liquid is 150 mL.
a) Estimate the amount of the solvent (mol) contained in the gas phase.
b) What assumptions did you make? How would you answer change if the species dimerized (one molecule results from two molecules of the species combining?
In: Chemistry
An industrial chemist introduces 6.8 atm H2 and 6.8 atm CO2 into a 1.00-L container at 25.0°C and then raises the temperature to 700.0°C, at which Keq = 0.534: H2(g) + CO2(g) ⇔ H2O(g) + CO(g) How many grams of H2 are present after equilibrium is established?
In: Chemistry
A sample of a gas mixture contains the following quantities of three gases.
| compound | mass |
|---|---|
| CO | 2.68 g |
| CO2 | 3.69 g |
| SF6 | 2.13 g |
The sample has:
volume = 2.50 L
temperature = 16.6 °C
What is the partial pressure for each gas, in mmHg?
What is the total pressure in the flask?
CO ___ mmhg
CO2 __mmhg
SF6 ____ mmHg
total ___ mmHg
In: Chemistry
A) 1 L of solution contains 0.10 mol Ag+ and 0.10 mol of Ba2+. If a highly concentrated solution of K2CrO4 is added drop by drop, which will precipitate first, Ag2CrO4 or BaCrO4?
Ksp for AgCrO4 = 2.0 x 10^-12; Ksp for BaCrO4= 1.2 x 10^-10
B) If the solution in part "A" contains 0.0010 Ag+ and 0.0010 mol of Ba2+ instead, which will precipiate first, Ag2CrO4 or BaCrO4?
Answers: A) Ag2CrO4 and B) BaCrO4
In: Chemistry
Plamitate uniformly labeled with tritium (3H) to a specific radioactivity of 3.0×·10^8 counts per minute per micromole was added to a mitochondrial preparation that oxidized 3H-palmitate to acetyl-CoA. The experiment calls for hydrolysis of the recovered acetyl-CoA to acetate and determination of the specific radioactivity of the acetate in counts per minute per micromole (cpm/μmol). Assuming that the palmitate is oxidized by the β-oxidation pathway and that there is no unlabeled fatty acid to dilute the tritium, what would be the expected specific radioactivity of the acetate? Show your reasoning and calculations.
In: Chemistry
Column Chromatography Lab
1. What would happen if diethyl ether were put in the column first instead of petroleum ether?
2. The recrystallization lab required you to purify naphthalene which contained a small portion of fluorenone. Could you use column chromatography to purify the same mixture? Would the selection of solvents be different from those used in this lab?
In: Chemistry
A 0.500 M solution of a weak base has a pH of 9.00. What is the base hydrolysis constant, Kb, for the weak base?
In: Chemistry
Calculate the pH for the titration 20.00mL of 0.500M HF with 0.500M KOH at the following volumes of added titrant:
a) 0.00 mL (before titration begins)
b)10.00mL (at 50% equivalence)
c) 19.00 mL (at 95% equivalence)
d) 20.00 mL (at equivalence point)
e) 21 mL (at 105% equivalence)
In: Chemistry
Write the balanced molecular equation for any reaction that occurs when the following solutions are mixed.
1. Ba(C2H3O2)2 and Na2SO4
2. NaClO4 and Pb(NO3)2
3. Mg(NO3)2 and Na3PO4
4. SrS and NiI2 (thats Nickel and Iodide)
In: Chemistry
Explain how to find the concnetration of an unknown when the when five reference have a mixture of five different compounds. by internal standard method
In: Chemistry
An electron in the n = 5 level of an H atom emits a photon of wavelength 4052.28 nm. To what energy level does the electron move?
In: Chemistry
And please show me the step by step process of how you solved the question. I have a learning disability and I need to know the steps to solve the question
If it takes 17.5 mL of 0.085 M NaOH to titrate a 15 mL sample of sauerkraut juice, what is the acidity of that juice, expressed as % lactic acid (wt/vol)?
In: Chemistry
How many milliliters of an aqueous solution of 0.212 M copper(II) chloride is needed to obtain 6.74 grams of the salt?
In: Chemistry
Ethanol can be synthesized by direct hydration of ethylene: C2H4(g) + H2O(g) ----> C2H5OH(g). at t = 300degC and P = 60 atm. Calculate the yield of the rxn for conditions as above and the equimolar (1:1) input mixture. Use following data: DfH298 (KJ mol-1): C2H4 = 52.4; H20 = -241.8; C2H5OH = -234.8. DfG298 (Kj mol-1): C2H4 = 68.4; H20 = -228.6; C2H5OH = -167.9
In: Chemistry