How many moles of calcium atoms do you have if you have 4.05x10^21 atoms of calcium

To calculate the number of moles of calcium atoms, you can use Avogadro's number, which is \( 6.022 \times 10^{23} \) atoms/mole. The formula to find the number of moles is:

\[
\text{moles} = \frac{\text{number of atoms}}{\text{Avogadro's number}}
\]

Substitute the values:

\[
\text{moles} = \frac{4.05 \times 10^{21}}{6.022 \times 10^{23}}
\]

Now, let's compute the result:

\[
\text{moles} \approx 0.00673
\]

So, you have approximately \( 0.00673 \) moles of calcium atoms.

Would you like more details or have any questions?

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Here are 5 related questions for further practice:

1. How many atoms are in 2 moles of calcium?
2. What is the mass of 0.00673 moles of calcium (given atomic mass = 40.08 g/mol)?
3. How many moles are in 1.50 × 10²² atoms of carbon?
4. How many atoms are present in 0.5 moles of calcium?
5. How do you convert between grams and moles for calcium?

**Tip:** Always remember to use Avogadro's number when converting between atoms and moles.

How many moles of calcium atoms do you have if you have 4.05x10^21 atoms of calcium?

Learn how to calculate the number of moles of calcium atoms from 4.05x10^21 atoms using Avogadro's number (6.022x10^23 atoms/mole). This chemistry problem provides a clear step-by-step solution for high school students, suitable for Grades 9-12.

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