Which of the following weighs most
(a) 2 gram-atom of oxygen
(b) 25 g of Fe
(c) `4 xx 10^(23)` atoms of carbon
(d) `22.4` litres of `CO_(2)`

Explanation

To determine which of the given options weighs the most, we need to convert all the options into mass (grams). Let's analyze each option step-by-step.

### Step 1: Calculate the mass of 2 gram-atoms of oxygen
- **Given:** 2 gram-atoms of oxygen.
- **Molar mass of oxygen (O):** 16 g/mol.
- **Calculation:**
\[
\text{Mass} = \text{Number of moles} \times \text{Molar mass} = 2 \text{ moles} \times 16 \text{ g/mol} = 32 \text{ grams}
...