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Determination of the Relative Atomic Mass of Lithium Results To determine the relative atomic mass of lithium I cut a piece of lithium, weighing 0.82g and reacted it with 100cm3 of distilled water. This reaction gives off hydrogen gas, which I collected in a 250cm3 measuring cylinder. I collected 129cm3 of hydrogen gas. To calculate the number of moles of hydrogen that I collected, assuming that 1 mole of gas occupies 24000cm3 at room temperature and pressure, I must divide the amount of gas I collected by 24000. 129 ÷ 24000 = 0.005375 moles I can use this information to calculate the number of moles of lithium that reacted. I will multiply the number of moles of hydrogen I collected by 2 because of the 2:1 ratio of the lithium used to hydrogen given off. 0.005375 × 2 = 0.01075 moles Now, by dividing the amount of lithium I used in the reaction, which was 0.082g,...

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