Need help, can't figure these out!
1. A flask contains oxygen carbon dioxide and nitrogen. The total pressure in the flask is 350 torr. If the partial pressure of the oxygen is 167 torr in the partial pressure of carbon dioxide is 82 torr what is the partial pressure of nitrogen?

2. A flask contains the ammonia, chlorine, and fluorine gas. The partial pressure of each gas are 5.4 ATM, 3.25 ATM, and 9.12 ATM respectively. What is the total pressure in the flask? Use 3 sig figs.

3. Under the same conditions of temperature and pressure, how many times faster will nitrogen (N2) if use compared to neon (NE)? Use 2 sig figs.

4. An unknown gas effuses 0.25 times as fast as He. What is the molar mass of the unknown gas? Use 2 sig figs