For helium, = 5/3 and the molecular mass is .004 kg/mol, so its speed of sound ... the speed of sound slightly because the molecular weight of water vapor is 18.... From reaction 5, the mols of water required to form 100 kmol HNO3 will be: 50 kmol = 900 kg mass of 100 kmol HNO3 = 100 x 63 = 6300 kg 6300 x 55 45 So,.... Mole [mol], kilomole [kmol], decimole [dmol], centimole[cmol], millimole [mmol], ... 1 cubic meter of water ( m 3 - cu m ) = 1,000.00 kilograms of water ( kg wt. ). 219d99c93a