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irina1246 [14]
3 years ago
14

Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecules ad contains 0.340 percent iron by

mass. calculate the molar mass of hemoglobin
Chemistry
1 answer:
Lelu [443]3 years ago
8 0
Molar mass of a compound is the equivalent mass of the compound per mole of it. To determine the molar mass of hemoglobin, we need to know the mass and the number of moles that is present in a certain sample. We make use of the values given above.
Given
0.340 percent Fe = 0.340 g Fe / 100 g hemoglobin
4 atoms Fe per 1 molecule of hemoglobin

Solution:
4 atoms Fe per 1 molecule of hemoglobin ( 1 mol Fe / 6.022 x10^23 atoms Fe) ( 55 .85 g Fe/ 1 mol Fe ) ( 6.022x10^23 molecule hemoglobin / 1 mol hemoglobin ) = 223.4 g Fe / mol hemoglobin

Molar mass = (100 g hemoglobin / 0.340 g Fe) (223.4 g Fe / mol hemoglobin) = 65705.88 g/mol hemoglobin

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Match each element to the number of electrons in its valence shell
blondinia [14]

Answer: Be= 2, C =4,  Li = 1 and  B=3

Explanation:

The valence shell can be define as the outermost shell of an atom that contains the valence electrons.

Beryllium (Be), electronic configuration; 1s2 2s2, = 2 electrons in its valence shell.

Carbon (C), electronic configuration; 1s2 2s2 2p2, = 4 electrons in its valence shell.

Lithium (Li), electronic configuration; 1s2 2s1 = 1 electron in its valence shell.

Boron (B) , electronic configuration; 1s2 2s2 2p1 = 3 electron in its valence shell.

6 0
3 years ago
Use the idea of diffuseition to explain how the smell of perfume travel​
pogonyaev
When perfume is sprayed in a room the particles of perfume diffuse with the particles in the air.
6 0
3 years ago
Nitrogen gas reacts with hydrogen gas to produce ammonia. How many liters of hydrogen gas at 95kPa and 15∘C are required to prod
viktelen [127]

Answer:

222.30 L

Explanation:

We'll begin by calculating the number of mole in 100 g of ammonia (NH₃). This can be obtained as follow:

Mass of NH₃ = 100 g

Molar mass of NH₃ = 14 + (3×1)

= 14 + 3

= 17 g/mol

Mole of NH₃ =?

Mole = mass /molar mass

Mole of NH₃ = 100 / 17

Mole of NH₃ = 5.88 moles

Next, we shall determine the number of mole of Hydrogen needed to produce 5.88 moles of NH₃. This can be obtained as follow:

N₂ + 3H₂ —> 2NH₃

From the balanced equation above,

3 moles of H₂ reacted to produce 2 moles NH₃.

Therefore, Xmol of H₂ is required to p 5.88 moles of NH₃ i.e

Xmol of H₂ = (3 × 5.88)/2

Xmol of H₂ = 8.82 moles

Finally, we shall determine the volume (in litre) of Hydrogen needed to produce 100 g (i.e 5.88 moles) of NH₃. This can be obtained as follow:

Pressure (P) = 95 KPa

Temperature (T) = 15 °C = 15 + 273 = 288 K

Number of mole of H₂ (n) = 8.82 moles

Gas constant (R) = 8.314 KPa.L/Kmol

Volume (V) =?

PV = nRT

95 × V = 8.82 × 8.314 × 288

95 × V = 21118.89024

Divide both side by 95

V = 21118.89024 / 95

V = 222.30 L

Thus the volume of Hydrogen needed for the reaction is 222.30 L

8 0
3 years ago
Water that is heated by the sun evaporates.
bagirrra123 [75]

Answer:

what do you need

Explanation:

5 0
2 years ago
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If a runner maintains a constant speed of 12 miles an hour how long will it take to complete a half marathon race of 13.1 miles?
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At 12 mph, how long does it take to go 13.1 miles?

We know that distance = rate * time
So we know that 13.1 = 12 * time
We can now see that time = 13.1/12 = 1.092 (hours)
That's approximately 1 hour and .092*60=5.52 minutes.
3 0
2 years ago
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