Hello, can someone help me with these three homework questions? I would really appreciate it! :( 7) A sample of air at 37 oC has a volume of 486 mL. What would the volume be when the temperature is -8 oC?

8) A balloon is filled with 17.0 L of a gas at 24 oC and a pressure of 675 mmHg. What is the pressure, in mmHg, of the gas in the balloon when the temperature is 27 oC and the volume is 33.0 L?

9) A cylinder is filled with a gas at a pressure of 127.5 kPa at a temperature of 290 K. What is the temperature, in oC, when the pressure is 3.51 kPa?

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .