can you solve this with simple details

Mixture containing 6.60gCO2 and some O2 occupies a 13.5L vessel at 55C. The partial pressure of O2 in the vessel is 379mmHg. (No reaction ocures between gases). find: 54 ) total pressure of mixture in mmHg. A) 227 B ) 379 (C) 603 D) 0.92 55) density of mixture in g/L A) 1.08 B ) 0.08 C) 4.89 D ) 2.76 56 ) root mean square speed of CO2 in m/s A ) 236 B ) 687 C) 359 D) 431