the molar mass of iron (iii) oxide (fe₂o₃) is 159.7 g/mol. what is the correct way to write the molar mass…

the molar mass of iron (iii) oxide (fe₂o₃) is 159.7 g/mol. what is the correct way to write the molar mass of iron oxide as a conversion factor?\n1. $\frac{159.7 g fe_{2}o_{3}}{159.7 mol fe_{2}o_{3}}$\n2. $\frac{1 g fe_{2}o_{3}}{159.7 mol fe_{2}o_{3}}$\n3. $\frac{159.7 g fe_{2}o_{3}}{1 mol fe_{2}o_{3}}$\n4. $\frac{1 g fe_{2}o_{3}}{1 mol fe_{2}o_{3}}$

the molar mass of iron (iii) oxide (fe₂o₃) is 159.7 g/mol. what is the correct way to write the molar mass of iron oxide as a conversion factor?\n1. $\frac{159.7 g fe_{2}o_{3}}{159.7 mol fe_{2}o_{3}}$\n2. $\frac{1 g fe_{2}o_{3}}{159.7 mol fe_{2}o_{3}}$\n3. $\frac{159.7 g fe_{2}o_{3}}{1 mol fe_{2}o_{3}}$\n4. $\frac{1 g fe_{2}o_{3}}{1 mol fe_{2}o_{3}}$

Answer

Explanation:

Step1: Recall molar - mass definition

Molar mass is the mass of one mole of a substance. For iron(III) oxide ($Fe_2O_3$) with a molar mass of 159.7 g/mol, it means that 1 mole of $Fe_2O_3$ has a mass of 159.7 g.

Step2: Write the conversion factor

The conversion factor is written as $\frac{159.7\ g\ Fe_2O_3}{1\ mol\ Fe_2O_3}$ to convert between moles and grams of $Fe_2O_3$.

Answer:

$\frac{159.7\ g\ Fe_2O_3}{1\ mol\ Fe_2O_3}$