A chemist accidentally leaves an open beaker containing 100.0 mL of a 0.400 M CuCl(aq) solution on a lab bench. They return a few days later to find that the volume of the solution has decreased to 30.0 mL. What is the molarity of this partially evaporated solution, assuming the solute does not evaporate? Give your answer to 2 decimal places.

Me gusta el triángulo, la respuesta es triángulo.

Explanation:

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.