How do you prepare 25 ml of 8.5 mM NaCl from a 20% NaCl stock? (Hint: convert 20% to g/ml then to molar)

For each pair of substances determine which has the higher entropy per mole of substance.

a. H2O (s) at 200 K or H2O(s) at 298 K.

b. H2(g) at 298 K, 2.0 atm or H2(g) at 298 K, 1.0 atm.

c. H2(g) at 298 K, 5.0 L or H2(g) at 298 K, 1.0 L

Accoring to the equation: As_sO₃ + 3C = 3CO +2As

the reaction of 1gmol of As_sO_{3 with carbon will result in the formation of:}

_{A. 1 gmol of CO}

_{B. 1 gmol of As}

_{C. 28 g of CO}

D. 150 g of As

A)Consider the following gases, all at STP: Ne, SF6, N2, CH4.

Which gas is most likely to depart from assumption 3 of the kinetic molecular theory (Attractive and repulsive forces between gas molecules are negligible.)?

Which one is closest to an ideal gas in its behavior?

Which one has the highest root-mean-square molecular speed?

Which one has the highest total molecular volume relative to the space occupied by the gas?

Which has the highest average kinetic molecular energy?

Which one would effuse more rapidly than N2?

B) A mixture of gases contains 0.75mol N2, 0.35mol O2, and 0.20mol CO2. The total pressure of the mixture is 1.57atm .

What is the partial pressure of O2?

What is the partial pressure of CO2?

C) What is the partial pressure in atm of O2 of this mixture if it is held in a 12.60?L vessel at 14?C? (O2 =.149mole)

What is the partial pressure in atm of N2 of this mixture if it is held in a 12.60?L vessel at 14?C? (N2= .241mole)

What is the partial pressure in atm of H2 of this mixture if it is held in a 12.60?L vessel at 14?C?(H2= .610mole)

Using the following equation (Debye-Huckel), find the coefficient of activity of the following:

a) Fe³⁺ with I = 0.062M answer should be 0.22

b) Ce⁴⁺I = 0.070M answer should be ≈ 0.08

c) Pb²⁺  I = 0.042M

Note: if you attempt this question please solve all parts (a,b and c) or else your answer will be rated as wrong/reported.

For the following reaction, KcKc = 255 at 1000 KK.
CO (g) + Cl2 (g) ⇌ COCl2 (g)CO (g) + Cl2 (g) ⇌ COCl2 (g)
A reaction mixture initially contains a COCO concentration of 0.1550 MM and a Cl2Cl2 concentration of 0.173 MM at 1000 KK.

a) What is the equilibrium concentration of COCO at 1000 KK?

b) What is the equilibrium concentration of Cl2Cl2 at 1000 KK?

c) What is the equilibrium concentration of COCl2COCl2 at 1000 KK?

please show work!

(Please explain step by step I have to be able to solve these myself). Write the auto-ionization reaction for water. Identify each conjugate acid-base pairs in the reaction. Derive an expression for the ionic product of water and state what that value is.

The system described by the reaction
CO(g)+Cl2(g)?COCl2(g)
is at equilibrium at a given temperature when PCO= 0.31atm , PCl2= 0.12atm , and PCOCl2= 0.59atm . An additional pressure of Cl2(g)= 0.39atm is added.

Find the pressure of CO when the system returns to equilibrium. in atm

What volume of a 0.305 M nitric acid solution is required to neutralize 18.3 mL of a 0.112 M potassium hydroxide solution?

__________ mL nitric acid

How can standard enthalpy and gibbs free energy of a reaction be used to determine yield at a particular temperature and pressure? The standard enthalpy of formation at 298K is -45.4 kJ/mol and the standard gibbs free energy at 298K is -7.7kJ/mol. The problem requires that the yield of the reaction be determined at 325K and 50 atm. Any help with this would be greatly appreciated.

1. When 100.0 mL of a 0.135 M Ca(NO3)2 (MM = 164.088 g/mol) solution is added to 50.0 mL of a 0.575 M K3PO4 (MM = 212.27 g/mol) solution, what mass of calcium phosphate (MM = 310.17 g/mol) will precipitate?

2. What is the final Na+ concentration if 17.0 mL of a 3.12 M NaCl solution is added to 83.0 mL of a 1.18 M Na2SO4 solution?

Define and provide examples of the following terms

(a) aromatic (b) hydrophilic (c) combustion

(d) methylene group (e) methyl group (f) common name

(g) IUPAC name (h) conformations (i) Newman projection

(j) eclipsed (k) staggered   (l) gauche conformation

(m) anti conformation (n) catalytic cracking (o) cis-trans isomers of a ring

(p) chair conformation (q) boat conformation   (r) distorted boat

(s) half chair conformation (t) axial position (u) equatorial position

(v) chair-chair interconversion (w) fused ring system (x) bridged bicyclic compound

(y) bridgehead carbon atoms

Cyanide ion, CN^-, is important in metal plating industries as well as in leaching matals from ores because it keeps metals dissolved under conditions where they would otherwise form solids (precipitate) and settle out of solution. It is important to maintain pH>10.5 in these solutions to avoid forming toxic hydrogen cyanide gas. If a solution is prepared by dissolving 10^-2M NaCN in water, will the pH be in the region where the solution is safe? What is {HCN} in the solution? The pKa of HCN is 9.24.

in free radical polymerization, wastage reaction are due to