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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