Question

A chemist weighed out 9.0 g of iron. Calculate the number of moles of iron she weighed out.

Round your answer to 2 significant digits.

Answer 1

0.16 moles Fe

Step-by-step explanation:

To convert the mass to moles, you need to multiply the given value by the molar mass of iron. The molar mass is a ratio that compares the mass of iron per every 1 mole. The ratio should be arranged in a way that allows for the cancellation of units (grams in the denominator).

Molar Mass (Fe): 55.845 g/mol

9.0 grams Fe 1 mole
---------------------- x ------------------------ = 0.16 moles Fe
55.845 grams