Note the following balanced chemical equation
`2CO+O_(2) implies 2CO_(2)`
Which one of the following statement is significant in relation to the above chemical equation ?

Options

A. one can add to a vessel only 2 mol of `CO` for each mol of `O_(2)` added
B. no matter how much of these two reagents are added to a vessel 1 mol of `O_(2)` is consumed
C. when they react co reacts with `O_(2)` in 2:1 mol ratio
D. when 2 mol of co and 1 mol of `O_(2)` are placed in a vessel they will react to give 1 mol of `CO_(2)`

Explanation

To analyze the balanced chemical equation \(2CO + O_2 \rightarrow 2CO_2\) and determine which statement is significant in relation to it, we can follow these steps:

### Step 1: Understand the Balanced Equation
The equation shows that 2 moles of carbon monoxide (CO) react with 1 mole of oxygen (O2) to produce 2 moles of carbon dioxide (CO2). This indicates the stoichiometric ratios of the reactants and products.

### Step 2: Analyze Each Statement
We need to evaluate the significance of the statements provided in relation to the balanced equation.

1. **Statement 1**: "One can add to a vessel only 2 moles of CO for each mole of O2 added."
- This statement reflects the stoichiometric ratio from the balanced equation (2:1). Therefore, this statement is correct.

2. **Statement 2**: "No matter how much of these two reagents are added to a vessel, 1 mole of O2 is consumed."
- This statement is misleading. The amount of O2 consumed depends on the amount of CO present. If more than 2 moles of CO are added, more O2 will be consumed. Thus, this statement is incorrect.

3. **Statement 3**: "When they react, CO reacts with O2 in a 2:1 mole ratio."
- This statement is also correct, as it directly reflects the stoichiometric coefficients in the balanced equation.

### Step 3: Conclusion
Based on the analysis:
- Statement 1 is correct.
- Statement 2 is incorrect.
- Statement 3 is correct.

Thus, the significant statements in relation to the balanced chemical equation are Statements 1 and 3.