How many moles are in #"4.555 g He"#?

1 Answer
Jan 30, 2016

Answer:

#"4.555 g He"# contain #"1.1380 mol He"#."

Explanation:

The molar mass of helium (He) is #"4.002602 g/mol"# (relative atomic mass on the periodic table in grams/mol), which means that one mole He has a mass of #"4.002602 g"#.

To determine the moles He in #"4.555 g He"#, divide the given mass by its molar mass.

#4.555cancel"g He"xx(1"mol He")/(4.002602cancel"g He")="1.1380 mol He"#