How many moles of He are in 16 g of the element?

1 Answer
May 1, 2017

Answer:

#4" moles of He"#

Explanation:

Look at the periodic table and find the molar mass of Helium.

http://www.keywordsuggests.com/lIkG0YEvhgjVW3F|bqpmjOC|3Q1OTcRgHkZMdVAh0AdlIqP07Ctda35xSJ|*ylhNwi0bnkXaASomScIDUvTrAg/

This tells us that #4.00# grams of #"Helium"# equates to #1" mole"#. We write it as follows:

#color(white)(aaaaaaaaaaaaaaaaa)(4.00"g He")/(1" mole")#

If we are given #16" grams"# of #"He"#, then we can use what we wrote above to figure out number of #"moles"# of #"He"#.

#(16cancel"g He")/(1) * (1" mole")/(4.00cancel"g He") = 4" moles of He"#

#"Answer": 4" moles of He"#