Answer Happy

can someone helo me with these questions i did my work but i still seem to get wrong answers
20. 4 moles of O2 gas initially with a volume of 0.05 ur is under a pressure of 1.5 x 10 Pa. It is then compressed at constant pressure to 0.03 m Assume the O, gas behinwes is an ideal gas. How much heat is input and what is the change in internal energy during the compression? A) AQ = - 4500.J. AU = 3000J. B) AQ --3000J, AU = 4500J. C) AQ = 7500J, AU = 3000). D) AQ = -7500J, AU = - 4500J. E) AQ = 4500J, AU - --3000 21. If the absolute pressure of an ideal gas is tripled while the absolute temperature of the gas is doubled, the volume occupied by the gas will A) change by a factor of 6. B) change by a factor of 3/2 C) change by a factor of 2/3 D) change by a factor of 1/6. E) We need to know the number of mole