A quantity of 4.50 g CaC2 is reacted with an excess of water at 298K and atmospheric pressure. CaC2 (s) + 2 H2O (l) --> Ca(OH)2 (aq) + C2H2 (g) Calculate the work done in Joules by the Acetylene gas against the atmospheric pressure.

Reference https://www.physicsforums.com/threads/calculate-the-work-in-joules-by-the-acetylene-gas.794536/

Molar Mass by Freezing Point Depression I am doing a latenite lab on Molar Mass by Freezing Point Depression. I have asked this question on Course Hero and twice on Chegg and the tutors keep giving me different answers. Sample 2 has a van't Hoff factor of 2. It began freezing at -3.6. I added 2 g of the unknown to 10 mL of water. I was given that the Kf for water is 1.86.

Calculate the molar mass of FP sample 2

The vapor pressure of liquid benzene is 17.7 kPa at 30 ºC and 37.7 kPa at 50 ºC. a) Calculate the enthalpy of vaporization of benzene. b) Estimate the vapor pressure at 10 ºC [use your answer from part (a)]. c) Estimate the normal boiling point of benzene (use a vapor pressure of 1 bar and use the result from part (a)]

1. Olive oil has a saponification value of 190 mg KOH per gram. This means that it takes 190 mg of potassium hydroxide to react completely with 1 g of olive oil.

(a) What is the mole ratio for the reaction of a triglyceride with KOH?

(b) Divide 0.190 g of KOH by its molar mass to calculate the number of moles of KOH that will react with 1 g of olive oil.

(c) Use the answers to (a) and (b) to determine the number of moles corresponding to 1 g of olive oil. Divide 1 g by this number of moles to calculate the average molar mass (g/mole) of olive oil.

1) Explain why there are so few metallic materials with one-dimensional bands. Naming and describe the type of distortion responsible for this.

2) Why are the superconducting critical temperatures of conventional superconductors often highest when the material has the apparently contradictory features of having strong bonds but poor orbital overlap between atoms associated with the conduction band?

calculate the mole fraction of a fractional distillation? How do I find the mole fractions of different distillations given only the refractive index, the temperature and which the distillation was acquired, and the makeup on the original solution before distillation?

the lab manual says to use P= (px * mol frac x)+(py * mol frac y)

but i don't know how I can find their partial pressure given that I don't know their mole fractions of the distillation since partial P=mole frac * vapor pressure.

The electro attractive inductive effect of the alkenyl and alkynyl groups has been attributed to the hybridization of unsaturated carbon with respect to that of saturated carbon. Discuss the rational basis of this idea.

Using standard electrode potentials calculate ΔG∘rxn and use its value to estimate the equilibrium constant for each of the reactions at 25 ∘C.

A. Cu2+(aq)+Zn(s)→Cu(s)+Zn2+(aq)

B. Br2(l)+2Cl−(aq)→2Br−(aq)+Cl2(g)

C. MnO2(s)+4H+(aq)+Cu(s)→Mn2+(aq)+2H2O(l)+Cu2+(aq)

Find K. All answers must have one significant figure. Please show all your work and equations used. Thank you!!

Calculate the percent ionization in a 0.1M solution of hydrofluoric acid (Ka=3.53*10^-4)

when the acid constants of tert-butyl alcohol and methanol are determined in the gas phase, tertiary alcohol is found to be a stronger acid. This result is opposite in aqueous medium. Consider the effects of solvation to explain these different results.

Calculate Percent Yield:

Palm oil was used for the creation of soap. The mass of the oil was 2.001 grams. The base used was 3 M of NaOH. After the experiment, the mass of the soap was 1.622 grams. What is the percent yield?

The average molar mass of the palm oil is 847.3 grams per mol. The average molar mass of the soap is 291.7 grams per mol. 3 mL of the base (NaOH) was used.

The Keq for the conversion of A to B is 1.15 x 10^-3. the Keq for the hydrolysis of ATP to Pi and ADP is 2.24 x 10⁵. the net conversion of A to B cannot take place if the molar ratio of B to A is greater than or equal to 1.15 x 10^-3. However, A can be converted to B if the reaction is coupled to the hydrolysis of ATP. Please explain and show any work!

A 49.96 mL sample containing La³⁺ was treated with sodium oxalate to precipitate La₂(C₂O₄)₃, which was washed, dissolved in acid, and titrated with 18.04 mL of 0.006363 MKMnO₄. Calculate the molarity of La³⁺ in the unknown.
(Hint: the reaction involved in the titration was: permanganate ion(s) + oxalate (ions) -----> manganese(II) ions + carbon dioxide. The reaction occurred in acidic aqueous solution)

1. How many grams of ethanol, C2H5OH, can be boiled with 863.7 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol. Answer in g.

2. How much heat energy is required to boil 12.7 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4kJ/mol. Answer in kJ