In the reaction: `2Al + Cr_(2) O_(3) rarr Al_(2) O_(3) + 2 Cr`,
`4.98 g` of `Al` reacted with `20.0 g Cr_(2)O_(3)`. How much grams of reactant ramains at the completion of the reaction?

Explanation

To solve the problem, we need to determine how much of the reactant Cr₂O₃ remains after the reaction between aluminum (Al) and chromium(III) oxide (Cr₂O₃) is complete. We will follow these steps:

### Step 1: Write the balanced chemical equation
The balanced chemical equation for the reaction is:
\[ 2 \text{Al} + \text{Cr}_2\text{O}_3 \rightarrow \text{Al}_2\text{O}_3 + 2 \text{Cr} \]

### Step 2: Calculate the molar masses of the reactants
- Molar mass of Al = 27 g/mol
...