How many helium atoms are there in a helium blimp containing 461  kg
  of helium?     

To find out how many helium atoms are in a helium blimp containing 461 kg of helium, we need to follow these steps:

1. **Find the molar mass of helium**: 
   Helium (He) has a molar mass of approximately 4.00 g/mol (which is 0.004 kg/mol).

2. **Convert the mass of helium from kg to moles**:
   Using the formula:
   \[
   \text{moles of He} = \frac{\text{mass of He (kg)}}{\text{molar mass of He (kg/mol)}}
   \]
   \[
   \text{moles of He} = \frac{461 \, \text{kg}}{0.004 \, \text{kg/mol}} = 115250 \, \text{mol}
   \]

3. **Use Avogadro's number to find the number of atoms**:
   Avogadro's number is \(6.022 \times 10^{23}\) atoms/mol, which tells us how many atoms are in one mole of a substance. So, the total number of helium atoms is:
   \[
   \text{Number of He atoms} = \text{moles of He} \times 6.022 \times 10^{23} 
   \]
   \[
   \text{Number of He atoms} = 115250 \, \text{mol} \times 6.022 \times 10^{23} \, \text{atoms/mol} 
   \]
   \[
   \text{Number of He atoms} \approx 6.94 \times 10^{28} \, \text{atoms}
   \]

So, the helium blimp contains approximately \(6.94 \times 10^{28}\) helium atoms.

Would you like more details on any part of this process?

### Related Questions:
1. How do we calculate the volume of a helium blimp given its mass?
2. What is the difference between the atomic and molar mass of an element?
3. How does Avogadro's number relate to the mole concept in chemistry?
4. How would the number of atoms change if the gas was a different element?
5. What assumptions are made when calculating the number of atoms in a gas?

### Tip:
Always ensure that units are consistent when performing chemical calculations to avoid errors!

How many helium atoms are there in a helium blimp containing 461 kg of helium?

Discover how to calculate the number of helium atoms in a blimp containing 461 kg of helium. This problem explores the mole concept, atomic theory, and the application of Avogadro's number. Suitable for high school students in Grades 10-12.

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