B. Decomposition is the correct answer~
Answer:
0.24 s-1
Explanation:
We first list the parameters as shown in the image attached. The variables are now properly substituted. This equation is used to calculate the rate constant and clearly show us the dependence of the rate constant on temperature. From this equation, we can clearly and easily see that the rate constant increases exponentially with increase in temperature of the reaction system.
Answer: The molarity of a solution that is 26.0% by mass in phosphoric acid is 3.06 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

n = moles of solute
=volume of solution in ml
Given : 26.0 g of phosphoric acid in 100 g of solution.
To calculate the moles, we use the equation:

Volume of solution =

Molarity of a solution that is 26.0% by mass in phosphoric acid is 3.06 M