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.
3. Calculate the amount (in moles) of each reactant. To do this, divide each reactant's mass by its molar mass. 1  To calculate a molecule's molar mass, add the atomic masses of each atom in the compound.2  An atom's atomic mass is the decimal number under its chemical symbol on the periodic table.. Calculate the amount (in moles) of each reactant. To do this, divide each reactant's mass by its molar mass. 1  To calculate a molecule's molar mass, add the atomic masses of each atom in the compound.