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3 years ago

Which of the following has the greatest mass? (1pt)

Chemistry

1 answer:

Oduvanchick [21]3 years ago

5 0

Answer:

C) 5 moles of Argon (Ar)

Explanation:

5mol Na x 22.990g Na/ 1 mol Na = 114.95g Na

5mol P x 30.974g P/ 1 mol P = 154.87g P

5mol Ar x 39.948g Ar/ 1 mol Ar = 199.74g Ar

Therefore Ar has the greatesr mass.

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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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3 years ago