A 10.0 mL sample of a 2.5 M NaCl solution is diluted to 25.8 mL. What is the new concentration?

Explanation:

Hello,

In this case, for dilution process, we can notice that the initial moles remain the same once the dilution is completed, therefore, both concentration and volume change considering:

In such a way for the given final volume, the resulting concentration is noticed to be:

This is supported by the fact that the higher the volume the lower the concentration.

Best regards.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.