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If lithium carbonate contains 18.8 percent lithium. What mass of lithium is present in a 1.55g of lithium carbonate?
Wiki User
∙ 11y ago
To work out the mass of one element within a compound (ie the mass of Lithium in Lithium Carbonate), first work out the RFM (Relative Formula Mass) of the compound.
To do this, look on the Periodic Table (PT) & add up the RAM (Relative Atomic Mass) of all of the atoms in the compound (the RAM is the larger of the 2 numbers in each box on the PT).
So, if the formula for one molecule of Lithium Carbonate is Li2CO3, then the RFM is Li + Li + C + O + O + O = 7 + 7 + 12 + 16 + 16 + 16 = 74
Next work out what percentage of the compound is the element you want to know.
So, Lithium accounts for 14 (2 Lithiums = 7 x 2) out of every 74 grams of Lithium Carbonate. As a percentage, this is ( 14 / 74 ) x 100 = 18.9 %.
So, 18.9% of 1.55g [ ( 1.55 / 100 ) x 18.9 ] = 0.29g
So there is 0.29g of Lithium is 1.55g of Lithium Carbonate.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoit is simply 1.55 multiply by (18.8 /100)=0.2914 grams
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