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The quantity that serves as a conversion factor between mass and number of moles is the molecular mass.
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
Moles = Mass/ Relative Molecular Mass Aluminum forms Al2 compounds, so the relative molecular mass is 2 * 13 = 26. 856/26 = 32.9 (3sf)
To answer this you must first be given the mass of the sample or at least percentage and molecular formula that phosphorus is in
No. of moles=given mass/gram molecular mass =16/16 =1
Calibration error (the equipment gives the incorrect result) and false assumptions (the sample is uniform and solid).
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. The molecular formula and the accurate molar mass would be N14O35.
I assume you mean the molecular mass. Its molecular mass is 342.3g/mol
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.
I assume you mean the molecular mass. Its molecular mass is 86.175
The molecular mass of cytosine is 111,10.