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2 years ago

How many protons are in the nucleus of an atom with an atomic number of 15

Chemistry

1 answer:

kykrilka [37]2 years ago

4 0

Answer:

15 protons

Explanation:

The atomic number always equals the number of protons inside the nucleus, so if the atomic number is 15, that means 15 protons are present.

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Kostya randomly chooses a number from 1 to 10. What is the probability he chooses a number less than 5?

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A. 1/2

Explanation- There is a 5/10 chance of choosing on of the numbers which simplifies to 1/2

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Iron is biologically important in the transport of oxygen by red blood cells from the lungs to the various organs of the body. I

Aneli [31]

Answer : The number of iron atoms present in each red blood cell are, $1.077\times 10^9$

Explanation :

First we have to calculate the moles of iron.

$\text{Moles of iron}=\frac{\text{Mass of iron}}{\text{Molar mass of iron}}=\frac{2.90g}{55.85g/mole}=0.0519moles$

Now we have to calculate the number of iron atoms.

As, 1 mole of iron contains $6.022\times 10^{23}$ number of iron atoms

So, 0.0519 mole of iron contains $0.0519\times 6.022\times 10^{23}=3.125\times 10^{22}$ number of iron atoms

Now we have to calculate the number of iron atoms are present in each red blood cell.

Number of iron atoms are present in each red blood cell = $\frac{\text{Number of iron atoms}}{\text{Total number of red blood cells}}$

Number of iron atoms are present in each red blood cell = $\frac{3.125\times 10^{22}}{2.90\times 10^{13}}$

Number of iron atoms are present in each red blood cell = $1.077\times 10^9$

Therefore, the number of iron atoms present in each red blood cell are, $1.077\times 10^9$

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2 years ago

In a solution there is usually more ____________than ___________ A) solute/solvent B) soluble/insoluble C) saturation/unsaturati

Elan Coil [88]

Answer:

I think the answer is option 3

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2 years ago

What is entropy in chemistry

goldfiish [28.3K]

Randomness. It is simply the measure of disorder.

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1 year ago

PLS HELP ME IN THIS QUESTION

Gnesinka [82]

Answer:

the first one is just water and the second one is gas

Explanation:

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