How many moles are present in 40 g of He?2 marks520610

To determine the number of moles present in 40 g of He, we need to use the formula:

moles = mass / molar mass

First, we need to find the molar mass of helium (He). The molar mass of helium is approximately 4 g/mol.

Now, we can substitute the values into the formula:

moles = 40 g / 4 g/mol

Simplifying the equation:

moles = 10 mol

Therefore, there are 10 moles of helium present in 40 g of He.