Regents Chemistry Exam August 2025 Question 19 At STP, 2.0 liters of Ar(g) contains 5.4 * 10^22 atoms. How many atoms are contained in 2.0 liters of Ne(g) at STP? (1) 2.7 * 10^11 (3) 5.4 * 10^11 (2) 2.7 * 10^22 (4) 5.4 * 10^22 Solution: STP stands for standard temperature and pressure. If two gases have the same temperature, pressure and volume (2L), they will also have the same number of atoms. Choice 3 is the correct answer choice. LINKS: Regents Chemistry Guides and Solu

Regents Chemistry Exam August 2025 Question 18 18.A sample of gas is in a sealed, rigid cylinder at constant volume. Which changes occur in the force of collisions of the gas particles and frequency of their collisions when the sample is cooled? (1)  Force of collisions decreases and frequency of collisions increases. (2)  Force of collisions decreases and frequency of collisions decreases. (3)  Force of collisions increases and frequency of collisions increases. (4)  Force o