Equilibrium

Kf=1.38 x 10 -28th power M/s. Kr = 9.3 x 10 10th power M/s. Both constants are at 25 degrees Celsius, how would I find the equilibrium constant at 25 degrees Celsius?

Solving for Ea and A

Data: T1 = 650 T2 = 700 K1 = 0.22 1/m.s K2 = 1.3 1/m.s Ea = R = 8.315 kj/K.mol I am using equation ln k2 - ln k1 = Ln k2/k1 = Ea /R [1/T2 - 1/T1] Since K1 + K2 are in 1/m.s do I have to get the inverse of those figures so that K1 = 4.545 m.s and K2 = .769 m.s? Second, solving for Ea: Ea/8.315 kj/k.mol * [1/7 ...continues

Acids/Bases

I need help setting this up to find the pKa so I can determine the strength of the acid. Benzoic acid is an organic acid with a Ka of 6.5x10^-5. It can also be used as a primary standard like KHP. If benzoic acid were used to standardize NaOH, how can I determine if if the equivalence point is acid, basic, or neutral based ...continues

Colligative Properties

An unknown organic compound is a nonelectrolyte known to be composed of C, N, O, and H. Combustion analysis showed that it contained 67.3% C, 4.62% N, and 6.93% H. A solution made by dissolving 1.20 g of the unknown compound in 25.0 g of benzene had a freezing point of 4.7 degrees Celsius. Determine: a) the empirical formula b ...continues

Pressure volume question

I need need help for the following. A flexible gas storage container has a volume of 3.5 x 10^2 L at a temperture of 27 degrees celcius and a pressure of 115 kPa. What is the new volume if the temperture drops to -10 degrees celcius and the pressure drops to 99 kPa?

A simple redox question (former AP question)

The ferrous ion, Fe2+(aq) reacts with the permanganate ion, MnO4- (aq), in an acidic solution to produce the ferric ion, Fe3+(aq). A 6.893 g sample of ore was mechanically crushed and tehn treated with concentrated hydrochloric acid, which oxidized all of the iron in the ore to the ferrous ion, Fe2+(aq). Next the acid solution ...continues

Simple problem set of multiple choice questions (3)

2. Find Eknot fora cell composed of silver and gold electrodes in 1 molar solutions of their respective ions: Eknot red Ag = .7991 volts, Eknot red Au = 1.68 volts a -.44 volts b 0 volts c .44 volts d .88 volts 5 A Zn|Zn2+||Cu2-|Cu cell has an Eknot of 1V. Calculate Gknot for the reaction (in kJ) b -193 c 1 d 1 ...continues

Molar and Concentration

If 4.oo mL of 0.0250 M CuSO4 is diluted to 10.0 mL with pure water, what is the molar concentration of copper (II) sulfate in the dilute solution? ______________________________ molar A 10.0-mL sample of 2.56 M HCL is diluted with water to 250. mL. What is the concentration of HCl in the diluted solution? Concentr ...continues

Mass and Molar

What mass of Na2CO3 in grams, is required for complete reaction with 50.0 mL of 0.125 M HNO3? Na2CO3(aq) = 2 HNO3(aq)-->2NaNO3(aq) = CO2(g) + H2O(l) mass________________grams

Molar

There is a file attached.