How to Convert Milligrams to Liters
- 1). Add together the atomic masses of the gas's elements to find the gas's relative molecular mass. For instance, if the gas is carbon dioxide (CO2), add 12, which is the atomic weight of carbon, to twice 16, which is the atomic weight of oxygen: 12 + (2 --- 16) = 44.
- 2). Divide the gas's weight in milligrams by 1,000 to convert it to grams. For instance, it you're converting 12 mg: 12 ÷ 1,000 = 0.012 g.
- 3). Divide the gas's weight in grams by its relative molecular mass: 0.012 ÷ 44 = 0.000273.
- 4). Multiply 22.4, the volume of a mole of gas, by this answer: 22.4 --- 0.000273 = 0.0061152. This is the number of moles of particles in the gas.
- 5). Multiply this answer by the ratio between the gas's temperature and 273.15, which is standard temperature. For instance, if the gas is at 500 K: 0.0061152 --- (500 ÷ 273.15) = 0.011194.
- 6). Multiply this answer by the ratio between 101,300, which is standard pressure, and the gas's pressure. For instance, if the gas is at 2,000 pascals of pressure: 0.011194 --- (101,300 ÷ 2,000) = 0.567. This is the gas's volume, measured in liters.
