For the following half reaction: N₂(g) + 5H⁺(aq)+4e^-   ----> N₂H₅⁺  

Calculate the amount of time required to produce 7.86 (g) of N₂ while using a 15.0 A current.

A bottle contains a 0.0525M (

Why is ΔH from the neutralization of HCl with NaOH is greater than that evolved for the neutralization of CH3COOH with NaOH?

Ba(NO₃)₂   +   NaIO₃   +   H₂O   →   Ba(IO₃)₂·H₂O   +   NaNO₃

5.274 g of barium iodate monohydrate was synthesized by a student by adding 30.00 mL of 5.242 x 10^-1 M Ba(NO₃)₂ to 50.00 mL of 8.221 x 10^-1 M NaIO₃.  

Calculate the theoretical yield of  Ba(IO₃)₂·H₂O   in grams.

Brownstock pulp and associated black liquor is stored in the blowtank after batch kraft cooking. From the blow tank it is pumpe at 12% consistncy to a diffuser washer(Modified norden equal to 5) followed by a vaccum drum washer(modified norden equal to 3). The dilution factor for the washing operation is 2kg fresh water per kg of dry pulp. The pulp and wash liquor move countercurrently in three washers. after the drum washer the pulp becomes part of the countercurrently flowing wash water.

Calculate the washing efficiency E in % for the total washing operation using the formula below which is valid for 12% pulp consistency throughout the washing system: E=100(1-.(1364(DF))/(1+.1364(DF)N+1-1) N- total number of mixing stages DF- net amount of water added(kg/kg pulp)

Also calculate the overall washing efficiency for the entire system of washers and press.

E0=[TF+(1-TF)DR]100

TF=(Win - Wout )/ Win

W= (100- consistency)/consistency

DR=(Cv-Cs)/(Cv-Cw)

Cv= vat solid solution, Cw= wash solids concentration, Cs= solids concentration in sheet leaving water

In a common classroom demonstration, a balloon is filled with air and submerged in liquid nitrogen. The balloon contracts as the gases within the balloon cool. Suppose the balloon initially contains 2.90 L of air at a temperature of 21.5 ∘C and a pressure of 0.996 atm .

Part A

Calculate the expected volume of the balloon upon cooling to -196 ∘C (the boiling point of liquid nitrogen). When the demonstration is carried out, the actual volume of the balloon decreases to 0.61 L.

Part B

Can you explain the difference between the observed volume of the balloon and calculated value?

Many economists favor a carbon tax as a way to discourage CO2 emissions. Suppose such a tax were to be set at $20 per ton (907kg) of carbon emissions as (CO2). Consider a 50-MW, 35% efficient power plant that uses coal with a carbon intensity of 24gC/MJ.

a. How much per year would this power plant pay in carbon tax?

b. Suppose a tree plantation sequesters (removes from the atmosphere and stores in biomass) 20,000kg of carbon dioxide per year per acre over the next 40 years the trees are growing (after which time the forest is mature and no further accumulation occurs). What area of forest would have to be planted to offset the power plant’s emissions over the next 40 years (roughly the lifetime of the power plant)?

c. What is the maximum the power plant owners would be willing to pay for this forest per acre? (do not use discounting)

a) A 2.5 L sample of gas at 25oC is heated to 50oC at constant pressure. What is the final volume? b) What temperature would be required to increase the volume from 2.5 L to 6.0 L?

Calculate the hydronium ion concentration in 0.120 M nitrous acid. ka( nitrous acid) =7.1x10^4. Use the ICE method to determone concentration of H3O+ = 9.23 x10^—3

A solution is prepared by dissolving 20.2 mL of methanol (CH3OH) in 100.0 mL of water at 25 ∘C. The final volume of the solution is 118 mL. The densities of methanol and water at this temperature are 0.782 g/mL and 1.00 g/mL, respectively. For this solution, calculate each of the following.

Part A
molarity
Express the answer using three significant figures.

Part B

molality

Express the answer using three significant figures.

Part C
percent by mass
Express the answer using three significant figures.

Part D
mole fraction
Express the answer using three significant figures.

why can the citric acid cycle not function without the electron transport chain?

The ammonia/ammonium buffer system is used to optimize polymerase chain reactions (PCR) used in DNA studies. The equilibrium for this buffer can be written as NH4+(aq)??H+(aq)+NH3(aq) Calculate the pH of a buffer that contains 0.045 M ammonium chloride and 0.095 M ammonia. The Ka of ammonium is 5.6×10?10. Express your answer using two decimal places.

boric acid (monoprotic acid of type HA with ka=5.0x10-5) is titrated against .200m naoh(aq)

a) calculate the ph after 20.0ml of .200 m Noah (aq) has been added to 50.0ml of .200m boric acid.

b) calculate the ph at the equivalence point

please show steps thank you

1) a. What is the molar concentration (i.e., molarity) of sucrose (C12H22O11) if 150.0 g is dissolved in 250.0 mL of solution?

b.What is the molar concentration of methanol (CH3OH) if 125.0 mL is dissolved in enough water to make 15.0 L of solution? The density of methanol is 0.792 g/mL.

c.How many grams of NaOH are contained in 250.0 mL of a 0.400 M sodium hydroxide solution?

d.The drinking water standard for lead is 15 ppb (parts per billion). What is this in M? (See Appendix C – Solution Preparation)

e.What volume of 0.650 M sucrose must be diluted with water to prepare 250.0 mL of 0.423 M sucrose? (See Appendix C – Solution Preparation)

f.Which of the following solutions contains the largest concentration of chloride ions: Which contains the largest number of chloride ions? Show work. a. 100 mL of 0.30 M AlCl3 b. 50.0 mL of 0.60 M MgCl2 c. 200.0 mL of 0.40 M NaC

(SHOW WORK, Expaniton) Thank you.

500.0 mL of 0.110 M NaOH is added to 615 mL of 0.200 M weak acid (Ka = 7.63