Asample of gas at 310 kelvin and 1.2 atmospheres has a density of 2.78 g/l. what is the molar mass of this gas? explain how you got your answer

Ideal gas law PV = nRT    or  PM = dRt ( M is molecular mass of gas ) and d is gas density 
where m/ M    ( m is mass of gas sample ) 

m = dRT / P  ( 2.78 g/L )   ( 0.082 L atm/ K mole )( 310K )  /  1.2 atm  =
58.9 g/mol

gas must be butane ( C4H10) has molecular mass = 58.9 g/mol

Depends on the speed of the car.

The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !