How many moles are present in a 34.0 g sample of iron metal?

1 Answer
Meave60
Apr 1, 2017

#"34.0 g Fe"# contains #"0.609 mol Fe"#.

Explanation:

Determine the molar mass of iron. Then divide the given mass by its molar mass, or multiply the given mass by the reciprocal of the molar mass, which is more common.

Molar mass is the mass of one mole of an element or compound.

#"1 mol Fe"##=##"55.845 g Fe"# #lArr# from periodic table

Another way to indicate molar mass is as follows:

#"molar mass Fe"##=##55.845 "g/mol"#

Determine moles of Fe present in #"34.0 g Fe"#.
Multiply the given mass by the reciprocal of the molar mass.

#34.0color(red)cancel(color(black)("g Fe"))xx(1"mol Fe")/(55.845color(red)cancel(color(black)("g Fe")))="0.609 mol Fe"#

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