I NEED HELP WITH CHEMISTRY WILL GIVE 70 POINTS FOR THESE 10 QUESTIONS!! CORRECT ANSWERS ONLY MUST SHOW WORK

question number 10 is

10. How much pressure would 4.85 moles of the gas exert in a 450 L tank at 55° C?

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

The form of energy that can move from place to place across the universe is (answer) on earth, the main source of this energy is (2nd answer) first blank; a) gravitational potential energy b) radiant energy c)thermal energy d) vibrational energy second blank; a)lightning b) the moon c) the sun d) the wind

Which expression can be used to calculate the density of an ideal gas? pm + rt mrt + pv mrt ÷ pv pm ÷ rt