Determine the pH of a solution that is 1.85% NaOH by mass. Assume that the solution has density of 1.01 g/mL.

Calculate how many milliliters of 0.663 M KOH should be added to 5.00 g of MOBS (see Table 8-2) to give a pH of 7.40. pKa=7.6. molecular weight=123.29

A- Calculate the pH at equilibrium point in the titration of 50mL of 0.1M HC2H3O2 with 0.16M NaoH. Ka=1.8^-5

B--Calculate the pH if 35mL of 0.025M HCl is added to 30mL of 0.030M NH3. Kb=1.8^-5

The excess Gibbs energy of solutions of methylcyclohexane (MCH) and tetrahydrofuran (THF) at 303.15 K was found to fit the expression
G E = RTx(1- x)[0.4857 – 0.1077(2x -1) + 0.0191(2x – 1)2 ]

where x is the molar fraction of the methylcyclohexane. Calculate the Gibbs energy of mixing when a mixture of 1.00 mol of MCH and 3.00 mol of THF is prepared.

Calculate the mass of carbon gas produced if 6.000g of K2CO3 reacts with 10.00ml of 2.00M HNO3 identify the limiting reagent as indicated a) if the amount of carbon dioxide collected is part a is 0.3542g, calculate the percent yield for the rection b) if the 0.3542g of carbon dioxide were collected at STP (0C and 1 atm), calculate th volumen of gas collected

Write the formula for the Bronsted-Lowry conjugate acid for each of the following bases.

NH2-

HSO4-

OH-

NH3

H2O

12) You need to reduce the radar cross-section of your company’s new plane.   It already has been built according to principle of radar dispersion, so you must find a materials solution.?

Please explain in clear words. Thanks

8) Given the following equation, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) ΔG°rxn = -2074 kJ

Calculate ΔG°rxn for the following reaction.

21 CO2(g) + 28 H2O(g) → 7 C3H8(g) + 35 O2 g)

A) +14518 kJ B) -2074 kJ C) -14518 kJ D) -296 kJ E) +2074 kJ

22) Given the following equation, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) ΔG°rxn = -2074 kJ

Calculate ΔG°rxn for the following reaction.

7 C3H8(g) + 35 O2(g) → 21 CO2(g) + 28 H2O(g)

A) -14518 kJ B) +2074 kJ C) -2074 kJ D) -296 kJ E) +14518 kJ

29) Given the following equation, H2O(g) + CO(g) → H2(g) + CO2(g) ΔG°rxn = -28.6 kJ

Calculate ΔG°rxn for the following reaction.

5 H2(g) + 5 CO2(g) → 5 H2O(g) + 5 CO(g)

A) +143.0 kJ B) -28.6 kJ C) -143.0 kJ D) +5.72 kJ E) -5.72 kJ

What is the Ka for a weak acid, HA, if a .2 M HA solution has a pH of 4.0?

Will iron(III) hydroxide precipitate from a pH = 1.00 solution with [Fe3+] = 1.0 x 10-5? Ksp Fe(OH)3 = 6.3 x 10-38

A 5.171 g sample of a solid, weak, monoprotic acid is used to make a 100.0 mL solution. 26.00 mL of the resulting acid solution is then titrated with 0.09671 MNaOH. The pH after the addition of15.00 mL of the base is 5.51, and the endpoint is reached after the addition of 47.85 mL of the base.

(c) What is the pK_a of the acid?

What is the potential of a cell made up of Zn|Zn²⁺ and Cu|Cu²⁺ half-cells at 25^o C if [Zn²⁺] = 0.25 M and [Cu²⁺] = 0.15 M?

(Answer should be E = +1.09 V but I need to know how to get to that)

0.560 g He, 20.482 g F₂, and 13.960 g Ar are placed in a 18.4-L container at 25 ^oC. What are the molar concentrations and partial pressures of the gases?
(All values to the nearest 0.0001)

What is the total pressure in the container?

P = atm

which one is more nucleophilic: hydroxide ion (OH) , or ammonia (NH3)? Explain why