Which factor does not affect the range of a projectile in ideal conditions (no air resistance)?

Mass of the projectile. In ideal conditions with no air resistance, the range of a projectile is not affected by its mass. The range is determined by the launch speed, launch angle, and the acceleration due to gravity, which remains constant for all objects near the Earth's surface. Increasing the launch speed or adjusting the launch angle can increase the range of the projectile. However, the mass of the object does not play a role in determining how far it will travel in ideal conditions. This principle can be understood through the basic equations of projectile motion, which do not include mass as a variable.