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Li: atomic mass 6.941
F: atomic mass 18.998
Lithium fluoride is made up of these two elements. Its balanced formula is LiF (Li+1F-1). Adding both its atomic masses equals 25.939. Therefore one mole of LiF is equal to 25.939 grams. So, 1.5 moles of LiF is equal to 38.90 grams.
Wiki User
∙ 13y ago
It is because the molar mass of LiF is 25 g/mol. Therefore, 1.5 moles of LiF would be equal to 1.5 moles x 25 g/mol = 37.5 grams of LiF. The value may be rounded to 39 grams for simplicity.
Wiki User
∙ 13y ago39.5 grams Li (1 mole Li/6.941 grams)(6.022 X 10^23/1 mole Li)
= 3.43 X 10^24 atoms of lithium
Wiki User
∙ 15y ago1.5 moles
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To find the grams of O2 in 15 moles, we use the molar mass of O2, which is 32 g/mol. 15 moles x 32 g/mol = 480 grams of O2. Therefore, there are 480 grams of O2 in 15 moles of O2.
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To find the number of moles of zinc in 15 grams, divide the given mass by the molar mass of zinc. The molar mass of zinc is approximately 65.38 g/mol. Therefore, 15 grams of zinc is equal to 0.23 moles of zinc.
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From the periodic table, lithium has an atomic weight of 6.941. The molar mass of an element is the atomic weight in grams. Therefore, 1 mole Li = 6.941g Li Therefore, moles Li = 15g Li X 1 mole Li/6.941g Li = 2.2 moles Li
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From the periodic table, lithium has an atomic weight of 6.941. The molar mass of an element is the atomic weight in grams. Therefore, 1 mole Li = 6.941g Li Therefore, moles Li = 15g Li X 1 mole Li/6.941g Li = 2.2 moles Li
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