For a particular reaction at 215.7 °C, ΔG = 404.91 kJ/mol, and ΔS = 748.20 J/(mol·K).

Calculate delta G for -74.3 celcius.

I've asked this question previously and the individual who answered got roughly 378 kj/mol which is incorrect.

A birthday candle is 2.5 inches long and 0.75 cm in diameter. It’s made of paraffin wax, which is a mixture of various hydrocarbons, but for the sake of argument we’ll assume it’s all C31H64, since that’s the major component. Its density is 0.90 g/cm3 paraffin. If air is 20.95% O2 by volume, and the density of O2 is 1.43 g/L, then how many liters of air will the candle consume if it completely burns up? (Note that paraffin combines with oxygen to make carbon dioxide and water.)

How many grams of solid ammonium chloride should be added to 1.50 L of a 0.145 M ammonia solution to prepare a buffer with a pH of 10.190 ?

A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 154 g of solution. The reaction caused the temperature of the solution to rise from 21.00 to 24.70 ∘C. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water. Enter your answer in kilojoules per mole of compound to three significant figures.

C_gas = 1.3 J/g×K    H_vap = 38.56 kJ/mol    C_liq = 2.3 J/g×K      H_fus = 5.02 kJ/mol    C_solid = 0.97 J/g×K

     Condensation Temp = 78.0^oC               Freezing Pt = -114.0^oC

Calculate the amount of heat required toconvert 92.6 mL of ethanol, C₂H₆O, from 110.0^oC to -98.0^oC.

A sample of natural gas contains 8.24 moles of methane, 0.421 moles of ethane, and 0.116 moles of propane. If the total pressure of the gases is 1.23 x 10³ mm Hg, what is the partial pressure of ethane? (Show your check)

a.1.29 atm

b.0.0656 atm

c.0.0214 atm

d.1.52 atm

e.0.0776 atm

Define each of the three terms in words and write the equation that relates kw, pH, and pOH.

Please finish and balance the following reactions, then state the molecular, complete ionic, and net ionic equations for each:

1. Pb(NO₃)₂ + NH₄OH --->

2. Pb(NO₃)₂ + H₂SO₄ --->

3. Pb(NO₃)₂ + HCl --->

4. Pb(NO₃)₂ + SnCl₄ --->

This question regards the process of making ice cream with dry ice:

How are thermodynamics involved in making the ice cream 'creamy' vs. 'grainy' (like what you get with freezer burned ice cream)?

ACID/BASE PRACTICE PROBLEMS

(a) 3 moles of sodium nitrate are placed in 1 L of water. Calculate the pH.

(b) Calculate the Ka and the % ionization of a weak acid if 0.02 moles of the acid is added to 1 L water and makes a solution with a pH of 4.75.

(c) A solution containing 0.2 moles of NaOH, 0.3 moles of HCl, and 0.1 moles of HF (Ka=7.1e-4) is added to 1 L of water. Calculate the pH and pOH.

(d) 0.2 moles of the salt acid of urea is added to 1 L of water, calculate the pH of the solution.

It is known that the vapor pressure of pure water at 77C is 41.847kPa, and at 100C is 101.325kPa

(a)   Derive the relationship of vapor pressure to the temperature

(b)  Calculate the vaporization enthalpy of water

(c)   What is the vapor pressure of water at 140 ℃?

(d)  1 mol superheated water, vaporized water vapor at 141℃, 100kPa external pressure, calculate the △ S of this process.

An aqueous solution contains 0.30 M hydrocyanic acid.

One Liter of this solution could be converted into a buffer by the addition of which of the following reagents?

(Assume that the volume remains constant as each substance is added.)

Question 15 options:(more than one choice)

show a general example of a net ionic equation for the nuetralization of a strong acid (HA)