From the question, the molarity of the desired solution was given as 0.235 M while the volume of the solution is 250 mL. Molarity is a unit of concentration used for solutions. It is necessary to first define what molarity is to be able to answer the question. Molarity is defined as number of moles of solute divided by the volume of the solution.
In this case, the amount of solid KCl required to obtain a concentration of 0.235 M in a volume of 250 mL is to be determined. The molar mass of KCl will also be used as conversion factor from unit of moles to grams. The value is 74.5513 g/mol. The following equation is used:
0.235 mol/ L x 1 L/1000 mL x 250 mL x 74.5513 g/mol KCl = 4.3799 g KCl
Thus, 4.38 g KCl is required to prepare 250 mL of 0.235 M solution.
Answer:
I think the answer is chemical energy
Explanation:
According to the given requirements, w<span>hen you crush a first-aid pack for an injured athlete and the pack gets cold, </span> A chemical change has occurred, with energy being absorbed is the true statement.
Hey there !
The answer would be C. 0.68L
Hope this helps !
In a mixture, elements are not chemically reacted. The elements forming a mixture can be separated by physical methods. These methods include titration, boiling, filtration and so on.
On the other hand, compounds are formed by the chemical combination of two or more elements. This means that the elements forming the compound cannot be separated by physical means . A chemical reaction must be used to separate the elements forming a compound.