They also are used for: 1  general anesthesia, 2  sedation prior to surgery or diagnostic procedures, 3  muscle relaxation,  alcohol withdrawal and drug associated 1  agitation, nausea and vomiting,  depression, 1  and. panic attacks.
Remember that 1 dm3 = 1 000 cm3 so the volume is also 12 000 cm3. The equation can be rearranged to find the number of moles, if the volume of gas at rtp is known: number of moles = volume of gas at rtp Ã· 24. Calculate the number of moles of hydrogen that occupy 6 dm3 at rtp. number of moles = 6 Ã· 24 = 0.25 mol.
There are two ways to solve this. The easier way involves knowing the density equation: D = (PM)/(RT) Where P is the pressure in atmospheres, M is the molar mass of the gas in grams per mole, R is the universal gas constant (0.0821 L*atm/mol*K), and T is the kelvin temperature. D = (2.3 atm)(32.00 g/mol) / (0.0821 L*atm/mol*K)(305 K) = 2.9 g/L The second way involves integrating your knowledge of density with the ideal gas law: You know that density is mass divided by volume: D = m / V The mass of the gas can be converted from the number of moles, if we could only know that. Fortunately we can work out the number of moles from the ideal gas law: PV = nRT Where n = the number of moles. Of course we don't know the volume of the gas, but that's okay...we don't have to.