# Hemoglobin, an oxygen-carrying protein in blood, contains 4 iron atoms per molecule and the iron comprises 0.34% of the molecules mass. What is the molecular weight of hemoglobin?

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4. ### Hemoglobin is the oxygen carrying molecule of red bloods and contains 4 atoms of iron per molecule of hemoglobin. A sample of hemoglobin weighing 13.4 g contains 45.6 mg iron. What is the molecular mass of hemoglobin?

I'm unsure of where to begin with this

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6. ### When iron rusts and forms iron oxide, the iron oxide has more mass than the iron. Which statement correctly explains this observation?

The iron atoms in iron oxide have more mass than pure iron. There are more iron atoms in iron oxide than in pure iron. The

9. ### what transition metal complex is responsible for transporting oxygen in our blood? Also, what is its structure?

The transition metal (there are several transition series---I assume you are referring to the 3d transition metals) is iron. As to its sturcure,

10. ### 4Fe + 3O2 = 2Fe2O3

So in math book it say " You can interpret this equation in terms of representative particles by saying that four atoms of iron react with three molecules of oxygen to produce two formula unit of iron(iii) oxide" Why it say that there are

12. ### 2. Which of the following is responsible for carrying nutrients to and waste from the body’s cells? (1 point)

plasma red blood cells red and white blood cells white blood cells 3. _________ defend the body against disease. (1 point) Fibrin Red blood cells

13. ### 2. Which of the following is responsible for carrying nutrients to and waste from the body’s cells? (1 point)

plasma red blood cells red and white blood cells white blood cells 3. _________ defend the body against disease. (1 point) Fibrin Red blood cells

15. ### Which of the following events are not examples of a chemical reaction?

atoms of gold turning into atoms of iron conversion of methane, which contains carbon and hydrogen, and oxygen into carbon dioxide and water <<<? the rusting of iron in a humid

18. ### The density of iron is 7.87 g/cm3, and the average mass for one iron atom is 9.28×10-23 g.

How many atoms are there in a rectangular iron ingot measuring 3.00 cm × 3.00 cm × 9.00 cm?

19. ### Write the balanced chemical reaction for the rusting of iron?

the acidic vinegar dissolved a protective coating off the steel wool, allowing the oxidation of the steel to begin. This process is called rusting. In this reaction, iron(III) is combined with

22. ### 1.) The protein that carries oxygen in our blood is known as

A. Anemia B. Hemoglobin C. Amino acid D. Messenger RNA

23. ### can some one help me with a few chem questions please.

A chunk of iron weighs 4.32 g. a) How many iron atoms are there in this sample? 55.85 g Fe = 1.00 mol Fe = 6.022 x 1023 atoms Fe b) How many moles of iron are there in this sample? 2. . You have a

26. ### 1.   Which statement is true about the following molecule?  (1 point)The molecule is composed of four atoms.The molecule contains oxygen atoms.The molecule is water.The molecule represents an element.

2. A(n) _____________ is made up of two or more

27. ### 1. Which elements are most abundant in living organisms?

A. hydrogen, carbon, calcium, potassium, oxygen, and phosphorus B. oxygen, calcium, phosphorus, sodium, hydrogen, and carbon C. carbon, potassium, iron, magnesium, hydrogen, and nitrogen D. oxygen,

29. ### Iron pyrite (FeS2) is the form in whichmuch of

the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a substantial contributor to acid

30. ### I have trouble understanding ratios and relativity so I can't understand how to use atomic mass units. Here is an example from my book:

How many grams of iron would contain the same number of iron atoms as the number of carbon atoms contained in 1.000 g of

1a) (ii) Why would a 15 year old male need more calcium than a 30 year old male? (iii) Why does a 25 year old pregnant female need more protein than a non-pregnant 25 year old female? 1b) A hammer hits a nail,

33. ### Iron pyrite (FeS2) is the form in which much of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce

iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a substantial contributor to

34. ### Iron pyrite (FeS2) is the form in whichmuch of

the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a substantial contributor to acid

35. ### One reason carbon monoxide (CO) is toxic in that it bind to the blood protein hemoglobin more

strongly than oxygen does. The hemoglobin – CO bond absorbs radiation of 1953 cm–1, which are in units of wavenumbers. Wavenumber is defined as the reciprocal

36. ### One reason carbon monoxide (CO) is toxic in that it bind to the blood protein hemoglobin more

strongly than oxygen does. The hemoglobin – CO bond absorbs radiation of 1953 cm–1, which are in units of wavenumbers. Wavenumber is defined as the reciprocal

39. ### An iron wire has a cross-sectional area equal to 1.20 10-5 m2. Carry out the following steps to determine the drift speed of the conduction electrons in the wire if it carries a current of 34.0 A.

(a) How many kilograms are there in 1.00 mole of iron? 1

41. ### Please help me with these AP Chemistry homework problems and show me the steps how to find the solutions:

Liquid-Liquid Tirations: What is the concentration of the unkown solution for each of the following titrations? #5) 25.36 mL of 0.178 M NaOH is

44. ### 2. Which of the following explains why the heart is organized so that it pumps blood to two different locations?

A. to supply blood to two different sides of the body B. to allow a way for the blood to pick up new blood cells C. to move oxygen-poor blood

45. ### I am having a hard time figuring out how to write a balanced equation for the reaction of iron and oxygen to produce iron(II) oxide.

I also need a balanced equation for the reaction of iron and oxygen to produce iron (III) oxide. I would appreciate any and

46. ### A couple questions here:

1. How do you expect nitriding to change the properties of iron? a) Nitriding makes iron stronger. b) Nitriding makes iron weaker. c) Nitriding makes iron more electrically conductive. d) Nitriding makes iron less electrically

48. ### Could someone please let me know if I am on the right track with this paragraph and feel free to critique me very strictly as my instructor will do.

My assignment was to explain what is in whole blood and what is the purpose of red cells,platelets and

49. ### 1. Iron reacts with oxygen according to the following equation:

Fe + O2→ Fe2O3 a. Balance the equation. b. Assuming you start with 15.0 g of iron, how many dm3 of oxygen are required to react? c. How many molecules of oxygen is this?

50. ### Would iron be considered a substance or a mixture? How about blood?

Iron is: http://en.wikipedia.org/wiki/Iron substance is a very general term: See definition 3: http://www.m-w.com/dictionary/substance Now blood is living tissue and as such very complex.

51. ### determine the mass of the following example 1.3 x 10^26 iron atoms in iron III oxide, mass of iron II oxide

I know this is a 2 part question and you have to use Avogadro's number, but I am clueless as to how to solve it.

55. ### Is blood a substance or mixture? Is iron a substance or mixture? I think blood and iron are both substances but my friend thinks that blood is a mixture and iron is a substance. PLEASE HELP ME!!!!!!

Substance is a very general term. Every piece of matter in

58. ### How do catalysts affect a chemical reaction?

lose activation energy provide activation energy increase activation energy lower activation energy*** What does the forward arrow in a chemical equation mean? The reaction is reversible. The reaction proceeds

59. ### The protein that carries oxygen in our blood is known as hemoglobin.

Which statement accurately describes sickle cell anemia? It affects the functions of red blood cells of humans. How are DNA and mRNA related? DNA is used as a template to make mRNA.

60. ### Based on the law of definite composition, Dalton proposed that one atom of carbon combines with two atoms of oxygen to always produce CO2.

Similarly,he proposed that two atoms of hydrogen combine with one atom of oxygen to give a molecule of H2O.

63. ### 1. Which of the following is not a function of the circulatory system?

breaks down large molecules delivers oxygen to body cells **** takes carbon dioxide away from body cells fights infection 2. Which of the following explains why the heart is organized so

64. ### 1. Which of the following is not a function of the circulatory system?

breaks down large molecules delivers oxygen to body cells **** takes carbon dioxide away from body cells fights infection 2. Which of the following explains why the heart is organized so

65. ### 1. Glucose is a simple sugar made up of carbon, hydrogen, and oxygen. What kind of molecule is glucose?

A) Glucose is protein B) Glucose is a nucleic acid*** C) Glucose is an organic molecule D) Glucose is an inorganic molecule 2. Glucose is a simple sugar.

66. ### Could someone let me know if I have balanced these equations correctly. balanced equation of the reaction of iron and oxygen to produce iron(ii)oxide.

2Fe + O2 = 2FeO Also if the balanced equation of the reaction of iron and oxygen to produce

68. ### Equation: Fe+CuCl2>FeCl2+Cu

We put two iron nails into the copper chloride solution:1. mass of empty dry beaker:103.64 2. mass of two iron nails, before reaction:1.20 3. mass of two iron nails after reaction: 1.01 4. mass of beaker and copper (dry):104.4

69. ### In an experiement 23.4 g of iron sulphide are added to excess oxygen and 16.5 grams of iron (III) oxide, Fe2O3 are produced the balanced equation for the reaction is 4FeS + 7O2 -- 2Fe2O3 + 2SO2

Calculate the percent yield of iron oxide in the experiement

70. ### Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen?

a. 12.0g b. 23.9g c. 47.8g d. 95.6g

74. ### How many moles of iron atoms are in

22.37 g of iron (II) sulfide, FeS?

76. ### I looked and could not find anything on iron smelting? Could you explain to me why it is a chemical process?

Iron ore is a chemical compound, it has to be decomposed into iron + other. Surely you jest!!! I went to www.google.com and typed in Iron smelting

78. ### How many atoms of iron will react with an excess of sulfur to form 3.098 grams of iron (II) product? Fe + S ---> FeS (2.12x10*25)

I would appreciate if an explanation would be given... I need more than just the answer. Thank you!

79. ### 5. How many grams of iron oxide can be produced from 2.50 g of oxygen reacting with iron, according to the following equation?

2 Fe (s) + 3 O2 (g) -->2 Fe2O3(s)

80. ### 5. How many grams of iron oxide can be produced from 2.50 g of oxygen reacting with iron, according to the following equation?

2 Fe (s) + 3 O2 (g) -->2 Fe2O3(s)

81. ### Given the equation: 4 Fe + 3 O2 -> 2 Fe2O3

- If I react 5.75 g iron with 3.00 g oxygen, what is the LR? - What is the theoretical yield of iron(III) oxide?

88. ### please balance this chemical equation iron +oxygen > iron (III) oxide +energy

Fe + O2> Fe2 O3 + heat and light

91. ### Iron(III) oxide is formed when iron combines with oxygen in the air. What is the mole ration of Fe used and the mole of Iron(iii) oxide produced? 4Fe(s) + 3O2(g) > 2Fe2O3(s)

a - 3:2 b - 4:3 c - 4:2 d - 3:4 Can someone help?

93. ### Iron ores have different amounts of iron per kilogram of ore.

Calculate the mass percent composition of iron for each iron ore: Fe2O3{\rm Fe_2O_3} (hematite), Fe3O4{\rm Fe_3O_4} (magnetite), FeCO3{\rm FeCO_3} (siderite).

95. ### Write the numbers in order of increasing size.

1/2,3/4,2/3,0.95 Convert to standard notation. 1.91 x 10-4 The ratio of the distances a 7-iron and a 5-iron will drive a golf ball is 5 to 6. If a golfer averages 153 yards with a 7-iron how far should he

96. ### how many molecules are in 5.5 moles of oxygen gas? How many atoms are in this quantity of gas?

I used dimensional analysis and did: 5.5 mol. of oxygen x 6.02x10^23 molecules/1 mol of oxygen I got 3.3x^24 molecules of oxygen How do I find the # of atoms? I

97. ### Can someone explain to me how 2,3 BPG works for hemoglobin?

BPG affects oxygen binding affinity by binding in a small cavity at the center axis of deoxygenated hemoglobin. In oxygenated hemoglobin, this cavity is too small to effectively accommodate

98. ### What is one mole of H2O composed of?

A. 2 hydrogen atoms and 1 oxygen atom B. 2 × (6.02 × 1023) hydrogen atoms and 6.02 ×1023 oxygen atoms C. 3 atoms of water and 2 oxygen molecules D. one half of a molecule of peroxide I say A