The number of moles of KI required to produce 0.4 mole `K_(2)HgI_(4)` is

Options

A. 1
B. 3
C. 6
D. 1.6

Answer

To solve the problem of how many moles of KI are required to produce 0.4 moles of K2HgI4, we can follow these steps:

### Step 1: Write the balanced chemical equation.
The formation of K2HgI4 can be represented by the following balanced equation:
\[ \text{HgCl}_2 + 4 \text{KI} \rightarrow 2 \text{KCl} + \text{K}_2\text{HgI}_4 \]

### Step 2: Identify the mole ratio from the balanced equation.
From the balanced equation, we can see that:
- 1 mole of K2HgI4 is produced from 4 moles of KI.

### Step 3: Calculate the moles of KI needed for 0.4 moles of K2HgI4.
Since 1 mole of K2HgI4 requires 4 moles of KI, we can set up a proportion to find out how many moles of KI are needed for 0.4 moles of K2HgI4:
\[ \text{Moles of KI required} = 4 \times \text{Moles of K2HgI4} \]
Substituting the value:
\[ \text{Moles of KI required} = 4 \times 0.4 = 1.6 \text{ moles of KI} \]

### Step 4: State the final answer.
Thus, the number of moles of KI required to produce 0.4 moles of K2HgI4 is **1.6 moles**.

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