What is the mass of 4.50 mol #Fe#?

2 Answers
May 1, 2016

Answer:

Elemental iron has a molar mass of #55.85# #g*mol^-1#

Explanation:

So the mass of the given molar quantity?

#4.50*molxx55.85*g*mol^-1# #~~# #250*g#

May 1, 2016

Answer:

4.50 moles #xx# molar mass of Fe
4.50 #xx# 55.9 = ?

Explanation:

Assume that:
n - number of moles
m - mass of substance
M - molar mass (same as atomic weight on periodic table)
#n = m -: M#

4.50 moles (n) has been given to you.

Now find the molar mass (M) of Fe. If you look into your periodic table, the molar mass of Fe is 55.9 g/mol.

To find the mass of substance (m), you need to flip over the formula, therefore, #m = M xx n#
The mass (m) of Fe is:
[55.9 g/mol #xx# 4.50 moles] = 251.6 grams.
Note: It is rounded to the nearest one decimal place.

4.50 moles of Fe should give you 251.6 grams of Fe.