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How many moles of lithium fluoride are in an 85.2 gram sample?


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Answered 2016-01-04 21:48:57

85.2 gram LiF sample is equivalent to 3,28 moles.

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Answered 2020-04-14 15:06:21

ygyu

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A 236 gram sample of nickel contain 4,021 moles.


1.0 gram Lithium (1 mole/6.941 grams Li) = 0.14 moles of Lithium


A 22.5 gram sample of ammonium carbonate contains 4.5 moles of ammonium ions.



5.0 mol Li * 6.941 g/mol Li = 34.705 = 35 g Lithium


For an element such as lithium, the technically correct term is "gram atomic mass" instead of "mole", and for lithium, the gram atomic mass is about 6.941. Therefore, the answer to the question is (5.48)(6.941) or 37.5 grams, to the justified number of significant digits.


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No. of moles=given mass/gram molecular mass =16/16 =1


The formula of sodium fluoride is NaF; its gram formula mass is 41.9882.


Calcium, Ca has atomic mass of 40.1Amount of Ca = 16.5/40.1 = 0.411molThere are 0.411 moles of calcium in a 16.5 gram sample.


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One gram of NaOH is equal is to 0,00225 moles.


There are 0.752 g of acetylsalicylic acid. The FW (formula weight) of aspirin is ~180 g/mol. moles = mass/FW.


Calcium, Ca has atomic mass of 40.1 Amount of Ca = 77.4/40.1 = 1.93mol There are 1.93 moles of calcium in a 77.4 gram sample.


Atomic mass of Mg = 24.3 Amount of Mg = 13.2/24.3 = 0.543mol There are 0.543 moles of magnesium in a 13.2 gram pure sample.



The formula mass of calcium chloride, CaCl2 is 40.1+2(35.5) = 111.1Amount of calcium chloride = 10/111.1 = 0.090molThere are 0.090 moles of calcium chloride in a 10 gram pure sample.


The atomic mass of silicon dioxide, SiO2 is 28.1 + 2(16.0) = 60.1Amount of SiO2 = mass of pure sample/molar mass = 11/60.1 = 0.183mol There are 0.183 moles of SiO2 in a 11 gram pure sample.


One gram of carbon is equal to 0,083 moles.


1 gram of C2H5OH is equivalent to 0,0217 moles.


The atomic mass of the organic compound CH3OH is 12.0 + 3.0 + 16.0 + 1.0 = 32.0Amount of CH3OH = mass of pure sample/molar mass = 5.00/32.0 = 0.156molThere are 0.156 moles of CH3OH in a 5.00 gram pure sample.


The molecular formula of water is H2O. The atomic mass of H2O is 2(1.0) + 16.0 = 18.0Amount of H2O = mass of pure sample/molar mass = 75/18.0 = 4.17mol There are 4.17 moles of water in a 75 gram pure sample.


Chemical Engineers sometimes measure substance amount in units of gram-moles, kilogram-moles, pound-moles, or ounce-moles; these measure the quantity of a substance whose molecular weight is not equal to its mass in grams, kilograms, pounds, or ounces. The SI mole is identical to the gram-mole. This is from wikipedia entry on moles. So 1 mole = 1 gram-mole


Since the gram atomic mass of calcium is 40.08 and calcium does not form polyatomic molecules, the number of moles in 40g of calcium is 1.0, to the justified number of significant digits.


This conversion requires a specific element. To convert moles to gram, you need to take the number of moles and multiply it by the atomic mass. If you do not have the atomic mass, you cannot go from moles to gram or grams to moles.



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