General Chemistry Answers

Ø Calculate the entropy change, ΔS^O for the following reactions using tabulated standard entropy values and figure out if the resulting values obtained are consistent with the expected entropy change as predicted qualitatively.

a. thermal decomposition of NaNO₃

2 NaNO₃(s) ---> NaNO₂(s) + O₂(g)

S^O values at 25°C

NaNO₃(s) = 116.5 /mol-K

NaNO₂(s) = 103.8 J/mol-K

O₂(g) = 205 J/mol-K

What is the mass percentage of 125g of fructose dissolved in 375mL of water?

What is the boiling point and freezing point solution of LiCl?

calculate the grams of solute that must be dissolved in 360 g of water in the preparation of a 15.0% potassium sulfate solution.

the vapor pressure of H2O at 28 degrees Celsius is 28.3mmhg find the vapor pressure of a solution containing 100g of sugar c12H22011 in 500g of H20 at 28 degrees celcius.

A mixture of hydrogen gas and chlorine gas reaction in bright sunlight to give hydrogen chloride.50cm3 of hydrogen gas was mixed with 40 cm3 of chlorine gas in a glass tube.Water was allowed into the tube without any escape of gasses.hydrogen chloride is very soluble in water.It is dissolved leaving other gasses.What is the volume of hydrogen chloride gas formed? What is the composition of the gasses left in the glass container

The conversion of cyclopropane to propene in the gas phase is a first order reaction with a constant rate of 6.7×10²⁴s-¹ at 500°C.

A. If the initial concentration of cyclopropane was 0.25M, what is the concentration after 8.8 min?

B. How long (in minutes) will it take for the concentration of cyclopropane to decrease from 0.25 M to 0.15 M?

C. How long (in minutes) will it take to convert 74 percent of the starting material?

What is the mass (in grams) of 1.70M sodium sulfide solution that would react with 105 g of cadmium nitrate solution?

Na2S + Cd(NO3)2 = CdS+2NaNO3

The answer is 34.66g. I'd like to know what exactly are the equations that got to that?

the components of a synthetic atmosphere are 80.5 mol percent Ar, 18.0 mol percent O2 and 1.5 mol percent CO2. If the total pressure of the gas mixture is to be 748 Torr, determine the partial pressure for the argon in the mixture.

What is the mass of 2.80 ×10

22

×1022 formula units of NaOH

NaOH (Molar mass = 40.0 g/mol

g/mol)