Please help with my homework

13. A 10.5mol sample of gas has a pressure of 5.0atm and temperature of 75C. What is its volume? 14. A 2.5L container is filled with 5mol Ne gas. What temperature is necessary for the sample to have a pressure of 1.75atm ? 15. A 3.0g piece of dry ice (solid CO2 ) is placed in a 7.3L container at 25C. What is the pressure in the container after all of the dry ice vaporizes? 16. A 1.0L,1.0mol sample of He is heated from 70C to 170C with no change in pressure. What is the new volume of the sample? 17. A sample of O2 gas is collected over water at 25C. The total volume is 250mL and the total pressure is 416 torr. How many grams of oxygen were collected? At this temperature, PH2O is 23.8 torr