Law enforcement uses a quick and easy test to detect the presence of the illicit drug PCP by reacting it with potassium iodide. The PCP will form a crystalline solid with a long branching needle-like structure with KI. What is the molarity of KI in a stock solution prepared by dissolving 390.1 g of KI to a total volume of 140.0 mL?

16.79 M

Explanation:

Given data

First, we will calculate the moles of KI, considering its molar mass is 166.00 g/mol.

390.1 g × (1 mol/166.00 g) = 2.350 mol

The molarity of KI is:

M = moles of solute / liters of solution

M = 2.350 mol / 0.1400 L

M = 16.79 M

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.