What is the specific weight of octane gas at 1.5 kgf/cm^2 gauge and 60 °F?

In a hypothetical diesel engine the fuel is compressed from 579mL to 32.9 mL.  This rasies the temperature of the fuel form 25°C to its ignition temperature of 210°C.  If the fuel begins at 1.00atm, what is the pressure of the fuel at its ignition temperature.? Express your answer to 1 decimal place

Carbon dioxide exists at 350 K. In the question that follows, select the answer that is closest to the true value. What is s° in units of kJ/kmol*K ?

A child takes a helium balloon on a plane from Denver (with an air pressure of 0.83 atm) on a cool day when the temperature is 20.0oC to Boston (at sea level, with an air pressure of 1.0 atm) where the temperature is 5.0oC.  Assume that no gas escapes from the balloon during the flight.  What is the volume of the balloon in Boston, relative to its size in Denver? Group of answer choices The volume in Boston is 0.79 times the volume in Denver. The volume in Boston is 0.20 times the volume in Denver. The volume in Boston is 0.87 times the volume in Denver The volume in Boston is 1.3 times the volume in Denver. The volume in Boston is the same as the volume in Denver.