20. rank the states of matter from slowest to fastest particle speed.

chemist is trying to prepare a solution of molarity 1.60 m by diluting a 2.13 m solution. this is a dilution equation and dilution formula needs to be used

c1v1 = c2v2

where c1 is concentration and v1 is volume of the more concentrated solution

c2 is concentration and v2 is volume of the diluted solution to be prepared

substituting the values in the equation

2.13 m x 1.24 l = 1.60 m x v2

v2 = 1.65 l

the volume of the diluted solution is 1.65 l

nitrogen is present in group 5. it contains 7 electrons and protons. it has 2 electrons in its first shell and 5 electrons in second shell. in order to determine the atomic number of nitrogen, we should know about the number of protons or electrons of the atom.

atomic number is denoted by z. z= number of protons. hence, nitrogen consists of seven protons as well as seven electrons. therefore, its atomic number (z) will also be 7.