Questions: Calculate the number of moles of He atoms present in 6.66 g of He.

Calculate the number of moles of He atoms present in 6.66 g of He.
Transcript text: Calculate the number of moles of He atoms present in 6.66 g of He.
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Solution

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Solution Steps

Step 1: Determine the molar mass of helium (He)

The molar mass of helium (He) is the mass of one mole of helium atoms. Helium has an atomic mass of approximately 4.0026 g/mol.

Step 2: Use the formula to calculate the number of moles

The number of moles (\(n\)) can be calculated using the formula: \[ n = \frac{\text{mass}}{\text{molar mass}} \] Given the mass of helium is 6.66 g and the molar mass is 4.0026 g/mol, we can substitute these values into the formula.

Step 3: Perform the calculation

\[ n = \frac{6.66 \, \text{g}}{4.0026 \, \text{g/mol}} \approx 1.664 \, \text{mol} \]

Final Answer

\(\boxed{1.664 \, \text{mol}}\)

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