Question

QUESTION 4
2 points
How many moles of atoms are in a 408.67 grams sample of iron? (Do not include units) Report your answer to 3 significant figures.

Answer 1

Moles of iron = 7.30

Further explanation

Given

mass of iron = 408.67 g

Required

moles of atoms

Solution

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

mol iron-Fe (Ar = 56 g/mol)

mol = mass : MW

mol = 408.67 g : 56

mol = 7.30