How many moles of nitrogen gas, n2, are there in 16.8 l of this gas at stp

  0.75 mol

Explanation:

- For any type of gas, the molar volume (the volume of one mole of     substance) at Standard Temperature and normal Pressure  is 22.4 L.

- Using cross multiplication,   1 mol    →   22.4 L

                                                        ?       →   16.8 L

So number of moles of N2 in 16.8 L  =  ( 16.8 L × 1 mol ) / 22.4 L = 0.75 mol ..

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation: