In order to prepare very dilute solutions, a lab technician chooses to perform a series of dilutions instead of measuring a very small mass. a solution was prepared by dissolving 0.360 g of kno3 in enough water to make 500. ml of solution. a 10.0 ml sample of this solution was transferred to a 500.0-ml volumetric flask and diluted to the mark with water. then 10.0 ml of the diluted solution was transferred to a 250.0-ml flask and diluted to the mark with water. what is the final concentration of the kno3 solution? 7.91 × 10-9 m1.42 × 10-4 m5.70 × 10-6 m2.85 × 10-6 m7.12 × 10-3 m

The final concentration of potassium nitrate is

Explanation:

To calculate the molecular mass of solute, we use the equation used to calculate the molarity of solution:

We are given:

Mass of potassium nitrate (solute) = 0.360 g

Molar mass of potassium nitrate = 101.1 g/mol

Volume of solution = 500.0 mL

Putting values in above equation, we get:

To calculate the molarity of the diluted solution, we use the equation:

         .......(1)

are the molarity and volume of the concentrated solution

are the molarity and volume of diluted solution

We are given:

Putting values in equation 1, we get:

are the molarity and volume of the concentrated solution

are the molarity and volume of diluted solution

We are given:

Putting values in equation 1, we get:

Hence, the final concentration of potassium nitrate is

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.