Answer: 16.25
Step-by-step explanation:
The molar mass of helium (He) is approximately 4 g/mol.
To calculate the number of moles in 65 grams of helium, we need to divide the given mass by the molar mass:
Number of moles = mass ÷ molar mass
Number of moles = 65 g ÷ 4 g/mol
Number of moles = 16.25 mol
Therefore, there are 16.25 moles of helium in 65 grams of helium.