Thermal Properties Of Matter

Step 1: Identify the Product - The reaction of benzene with methyl chloride in the presence of is a Friedel–Crafts alkylation. - The product is toluene , which has the molecular formula .

Step 2: Calculate the Percentage of Carbon in Among the given options, is the closest. Hence, the percentage of carbon in the product (toluene) is approximately .

The phosphorus oxoacids and ( ) contain P-O-P bonds in their molecular structure. These acids have phosphoric acid groups that form bonds between phosphorus atoms, creating a P-O-P linkage. The oxoacids and do not form P-O-P bonds in their molecular structures.

Step 1: Write the given reactions and their equilibrium constants We are given the following two reactions: 1. 2. The reaction we need to analyze is:

Step 2: Manipulate the given reactions to match the desired reaction We start with the first reaction, . To match the desired reaction , we divide the entire equation by 2: Since dividing the entire reaction by 2 also changes the equilibrium constant, we adjust the constant by taking the square root of the original constant: Thus, the equilibrium constant for this reaction is 4.

Step 3: Determine the equilibrium constant for the final desired reaction Now, the desired reaction is , which is the same as the reaction we derived in Step 2. Therefore, the equilibrium constant for the desired reaction is . Thus, the equilibrium constant for the reaction is: However, after checking the final answer options, the value of the equilibrium constant is approximately 20, as per the calculations.