Question

A student has 3.86 g of iron metal. How many moles of iron does the student have? Show your work.

Answer 1

Answer:

The answer to your question is:

a) 0.069 moles of Iron

b) 0.052 moles of Oxygen

Explanation:

Data

mass Iron = 3.86 g

moles = ?

Atomic weight Fe = 56 g

Process

a) Solve it using a rule of three

                                56 g of Fe ---------------- 1 mol

                               3.86 g ----------------------  x

                                x = (3.86 x 1) / 56

                                x = 0.069 moles of Iron

b)

Balanced Equation

                              4Fe  +  3O₂  ⇒   2Fe₂O₃

Solve it using a rule of three

                              4 moles of Fe -----------------  3 moles of O₂

                              0.069 moles of Fe ---------   x

                             x = (0.069 x 3) / 4

                             x = 0.052 moles of Oxygen