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15g Li * (1mol Li / 6.941g Li) = 2.16 mol Li
Elza Olson
Wiki User
∙ 14y agoAtomic weight for Li: 6.941 g/mole (according to its atomic weight on the Periodic Table)
Using dimensional analysis: (15g)/(6.941 g/mol) = your answer in moles.
Another way to write this is: (16g) x (1 mol/6.941g)
Wiki User
∙ 13y agoFirst, look up Lithium's molar mass on the periodic table, which is 6.941 g, meaning there are this many grams per mole of Lithium.
Next use dimensional analysis to find your answer:
25.0 g Li (1 mol) = 3.60 mol
( 6.941 g)
It's important to put the grams on bottom and moles on top so that the grams cancel and you are left with moles.
You started with 3 significant figures, so that's how many your answer should have.
Wiki User
∙ 14y ago15g Li * (1mol Li / 6.941g Li) = 2.16 mol Li
Wiki User
∙ 16y agoOne mole of any element or conpound is equal to its Atomic Mass in grams. The atomic mass of Li is 7 AMU so 1 mole is 7 grams. So there are three moles of Li in 21 grams
Wiki User
∙ 12y agoRelative Formula mass of Lithium = 7g
Actual mass/Relative formula mass = moles
15/7 = 2.14 moles
Wiki User
∙ 10y agoAtomic mass of lithium, Li is 6.9
Amount of Li = 25/6.9 = 3.62mol
There are 3.62 moles of lithium in a 25g pure sample.
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