If you add more molecules but do not change the temperature or the pressure, what will happen to the system? the molecules will move faster
O the volume will decrease
the volume will increase
the molecules will move slower

the volume will increase

Explanation:

The kinetic energy of gas molecules depend upon the temperature . If temperature is increased , the molecules will move faster . When temperature is decreased , they move slower .

Hence when more molecules are added to a gas without changing its temperature , the velocity of gas molecules will remain unchanged .

Since pressure  is also constant , it is volume which will be increased .

It can be explained from universal gas formula as follows

PV = nRT

P , R and T is constant ,

V ∝ n

Volume is proportional to n which depends upon number of molecules .

So volume will increase if number of molecules increases .

distance, luminosity, brightness, radius, chemical composition, and temperature

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.