In a constant‑pressure calorimeter, 60.0 mL of 0.920 M H 2 SO 4 was added to 60.0 mL of 0.360 M NaOH . The reaction caused the temperature of the solution to rise from 22.43 ∘ C to 24.88 ∘ C. If the solution has the same density and specific heat as water ( 1.00 g / mL and 4.184 J / ( g ⋅ °C), respectively), what is Δ H for this reaction (per mole of H 2 O produced)? Assume that the total volume is the sum of the individual volumes.

suppose you dissolved 2000 U of enzyme in 1 ml of buffer. you take a 20 microlitre of diluted enzyme and add it to 1 ml of substrate solution with a concentration of 0.5mM. how long would it take to covert all of the substrate in the solution? ( assume ideal conditions)

Question #48. In a titration experiment, 50 mL of 0.1 M acetic acid (Ka = 1.75 x 10-5) was titrated with a 0.1 M NaOH (formal concentration) at 25 ºC. The pH of the solution at the equivalence point will be this: Please show work (1) 7.00; (2) 8.73; (3) 9.06; (4) None of the above

A 2.250×10⁻² M solution of glycerol (C3H8O3) in water is at 20.0∘C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.0 mL . The density of water at 20.0∘C is 0.9982 g/mL.

Part A:  

Calculate the molality of the glycerol solution.

Express your answer to four significant figures and include the appropriate units. Definitely not 0.0225

Part B: Calculate the mole fraction of glycerol in this solution.

Express the mole fraction to four significant figures. definitely not 55.40

Part C:  Calculate the concentration of the glycerol solution in percent by mass.

Express your answer to four significant figures and include the appropriate units. definitely not 0.002

Sulfuryl chloride, SO2CL2, is a compound with very irritating vapors; it is used as a reagent in the synthesis of organic compounds. When heated to a sufficiently high temperature, it decomposes to So2 and Cl2 .

Kc= 0.045 at at 375°C

Complete the stoichiometry table using the starting values provided.

theoretical product

melting point of triphenylmethanol ...................... in degree celsius

Select the name of the catalyst used for this reaction, if there was no catalyst used, select none:

a) bromobnzene

b) magnesium

c) benzophenone

d) diethyl ether

e) none

Please clearly state step by step solution to show how you arrived with final answer. (your help will be so much for me if you can state step by step solution). Thanks!

1. Explain how an emulsifier can combine a nonpolar substance with a polar substance.

2. Mayonnaise is a thick mixture containing oil, vinegar (water-based), and a phospholipid molecule called lecithin found in the yolks of eggs. Mayonnaise cannot be made without lecithin. Explain why lecithin is a critical ingredient.?

14) you are titrating 10.0mL of a solution of 0.25M acetic acid (Ka=1.8 x 10 ^-5). you are using a solution of 0.10M KOH to complete the titration curve. create the graph that would result by adding 1.0mL of the base to the acid and determining the pH and repeating until you have passed the equivalence point. Start the graph with 0 mL of the base solution added.  

2. Which of the following gases could have the same pressure and temperature? All of the containers are rigid and have the same volume.

A.Ne and N2

B.O3 and H2O

C.N2 and O3

D. Ne, N2, and H2O

Calculate the pH of a buffer that is 0.10 M in KH2PO4 and 0.050 M in Na2HPO4. What is the pH after adding 5.0 mL of 0.20 M HCl to 0.10 L of this buffer. The Ka value for H2PO4– is 6.32 × 10–8 or a pKa of 7.199

What does the titration curve for 5ml pH 5.6 acetate buffer being titrated with 1.5M NaOH look like?

What is the buffer capacity?

What volume is needed to change pH from initial pH to neutralization etc.

If the gas-solid equilibrium amounts to a monolayer capacity of 150cc(STP)/g of N2 (16.2e -20 m^2/ molecule), the surface area of 1g of the solid adsorbent exceeds 850 m^2. True or False?

10) You want to create a buffer using phosphoric acid and Sodium Dihydrogen Phosphate. what is the best pH at which to make the buffer? using that pH and a concentration of 1M. Determine the molar concentrations of each component (acid and base) needed to make the buffer. If you need 100mL of the buffer, how many mL of 2.5 M phosphoric acid will you need? How many grams of the Sodium Dihydrogen Phosphate do you need?

11) using the buffer you created in problem 10 calculate the change in pH if you add 1 mL of 0.50M HCl to the buffer.

12) using the buffer you created in problem 10. calculate the change in pH if you add 2 mL of 0.50 NaOH to the buffer.