The heme level regulates the globin synthesis because _____.

A sample of gas initially has a volume of 1.42 L at 293 K and 1.30 atm. What volume will the sample have if the pressure changes to 1.50 atm while the temperature is increased to 322 K?

There are a number of steps involved in determining the empirical formula of a compound. You will need to demonstrate that you can complete all of these steps as you determine the empirical formula of a compound composed of phosphorus and chlorine that is 14.87 % P by mass. Complete your calculations based on 100 g of this compound. Enter all calculated values in 4 significant figures followed by one space and the appropriate unit. Use g for grams and mole for moles. Do not use scientific notation.

Determine the mass in grams of chlorine present in the sample. Answer

Determine the number of moles of phosphorus in the sample. Answer

Determine the number of moles of chlorine in the sample.
Answer

The moles of (Answer Cl or P) represents the smaller mole value.

Write the empirical formula of the compound. You will not be able to show subscript values correctly. For example, H2O would be recorded for water.
Answer

3MgCl2(aq) + 2Na3PO4(aq) ------> 6NaCl(aq) + Mg3(PO4)2(s)

1.) If given 29 grams of each reactant, determine the limiting reagent.  

2.) Based on your answer from number 1, what is the theoretical yield of this reaction for Mg3(PO4)2?

3.) Based on your answers from questions 1 and 2, if you were to perform this reaction and generate 20 grams of material, what is the % yield of the reaction?

4.) Based on your answers to the previous 3 questions, when 4 moles of MgCl2 are allowed to react with an excess of Na3PO4 how many moles of NaCl are produced?

1) A certain weak acid, HA, has a Ka value of 4.6×10⁻⁷.

Part A

Calculate the percent ionization of HA in a 0.10 M solution.

Express your answer to two significant figures and include the appropriate units.

Part B

Calculate the percent ionization of HA in a 0.010 M solution.

Express your answer to two significant figures, and include the appropriate units.

2)

A 0.120 M solution of a weak acid (HA) has a pHof 3.31.

Calculate the acid ionization constant (Ka) for the acid.

Express your answer using two significant figures.

3)

Ammonia, NH3, is a weak base with a Kb value of 1.8×10−5.

Part A

What is the pH of a 8.00×10⁻²M ammonia solution?

Express your answer numerically to two decimal places.

Part B

What is the percent ionization of ammonia at this concentration?

Express your answer with the appropriate units.

4)

If Kb for NX3 is 8.5×10⁻⁶ , what is the the pKa for the following reaction?

HNX3+(aq)+H2O(l)⇌NX3(aq)+H3O+(aq)

Consider the titration of a 33.0 mL sample of 0.175 M HBr with 0.210 M KOH. Determine each of the following:

Part A the initial pH

Express your answer using three decimal places. pH =

Part B the volume of added base required to reach the equivalence point

Express your answer in milliliters. V =

Part C the pH at 11.0 mL of added base

Express your answer using three decimal places. pH =

Part D the pH at the equivalence point

Express your answer as a whole number. pH =

Part E the pH after adding 5.0 mL of base beyond the equivalence point

Express your answer using two decimal places pH =

How to determine the heat of formation of sucrose after a bomb calorimeter experiment?

A chemistry handbook lists the solubility of sodium iodide (NaL) as 184 g per 100 ml of water at 25^o C.

What would be the percent by mass of a NaL solution prepared by dissolving 95.0 g NaL in 450 g water?

At 365 K, pure toluene and hexane have vapor pressures of 5.82 x 10⁴ Pa and 1.99 x 10⁵ Pa, respectively.

a.) Calculate the mole fraction of hexane in the liquid mixture that boils at 365 K at a pressure of 1140 Torr.

b.) Calculate the mole fraction of hexane in the vapor that is in equilibrium with the liquid of part (a).

63. Which of the following is an omega 3 fatty acid?

A.   18:0

B.   18:3 Δ^9,12,15  

C.   16:1 Δ⁹

D.   18:2 Δ^9,12

E.   20:4 Δ^5,8,11,14

64. Which of the following is an essential fatty acid?

A.   lauric acid

B.   oleic acid

C.   linoleic acid

D.   linolenic acid

E.   both C and D are essential fatty acids.

The solubility product constant for CuI(s) is 1.1 x 10^-12. Calculate the value of E knot for the half-reactoin: CuI + e- ---> Cu + I-.

For Cu+ + e- ---> Cu, E knot = 0.52V

What major factor(s) affect the experimental determination of the heat of formation of magnesium oxide using calorimetry?

A 20.00 mL solution of 0.0840M HOCl is titrated with 0.0560M KOH solution. Calculate the pH after each of the following additions of the KOH solution:

a. 15.00mL

b. 30.0mL

c. 32.0mL

If He(g) has an average kinetic energy of 4890 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

Ways and sugesstions to improve Aldol Reaction: Dibenzalacetone lab/ experiment?