Answer :
There are 1.31 moles of HCN in a sample weighing 35.5 grams. To find the number of moles of HCN in a sample weighing 35.5 grams, we need to divide the given mass by the molar mass of HCN.
The mole is a SI unit; why?
An SI unit that connects the microscopic and macroscopic worlds is the mole. It enables researchers to measure vast numbers of extremely small objects, such atoms or molecules. Initially, measurements of chemical elements or compounds were expressed in terms of "gram-atom" and "gram-molecule" units.
The molar mass of HCN can be calculated as follows:
Molar mass of H = 1.01 g/mol
Molar mass of C = 12.01 g/mol
Molar mass of N = 14.01 g/mol
Molar mass of HCN = (1.01 g/mol) + (12.01 g/mol) + (14.01 g/mol) = 27.03 g/mol
Now we can calculate the number of moles of HCN:
moles of HCN = mass of sample / molar mass of HCN
moles of HCN = 35.5 g / 27.03 g/mol
moles of HCN = 1.31 mol
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