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How count molecular by measuring mass of a sample?

Updated: 8/20/2019
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Q: How count molecular by measuring mass of a sample?
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What quantity serves as the conversion factor between the mass of a sample and how many moles the sample contains?

The quantity that serves as a conversion factor between mass and number of moles is the molecular mass.


How many moles in 100grams of ammonia?

The molecular formula of ammonia is NH3The molecular mass of NH3 is 14.0 + 3(1.0) = 17.0 Amount of NH3 present = mass of sample/molar mass = 100/17.0 = 5.88g


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Moles = Mass/ Relative Molecular Mass Aluminum forms Al2 compounds, so the relative molecular mass is 2 * 13 = 26. 856/26 = 32.9 (3sf)


How many moles of phosphorus?

To answer this you must first be given the mass of the sample or at least percentage and molecular formula that phosphorus is in


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


What are two possible sources of error when measuring a sample's mass and volume?

Calibration error (the equipment gives the incorrect result) and false assumptions (the sample is uniform and solid).


How many moles make up 350g of sodium?

The chemical symbol for sodium is Na. Amount of Na = mass of sample/molecular mass = 350/23.0 = 15.2mol


A sample of a compound contain 1.52 g of Nitrogen and 3.47 g of Oxygen. The molar mass of this compound is between 90 grams and 95 grams. Determine molecular formula and the accurate molar mass.?

A sample of a compound contain 1.52 g of Nitrogen and 3.47 g of Oxygen. The molar mass of this compound is between 90 grams and 95 grams. The molecular formula and the accurate molar mass would be N14O35.


What is the molecular for sucrose?

I assume you mean the molecular mass. Its molecular mass is 342.3g/mol


How many moles in NaCHO3?

A mole is a defined number of atoms/molecules of an element/compound. Therefore, the number of moles of NaCHO3 will depend on the mass of NaCHO3 that you have. To calculate the number of moles in a known sample, divide the mass of the sample (in grams) by the molecular weight.


What is the mass of hexane?

I assume you mean the molecular mass. Its molecular mass is 86.175


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The molecular mass of cytosine is 111,10.