Calculate the mass of 4 mol in HCl.

To calculate the mass of 4 mol of HCl, we first need to determine the molar mass of HCl.

The molar mass of HCl is the sum of the atomic masses of hydrogen (H) and chlorine (Cl).

The atomic mass of hydrogen is approximately 1.008 g/mol, and the atomic mass of chlorine is approximately 35.453 g/mol.

Therefore, the molar mass of HCl is:
1.008 g/mol (H) + 35.453 g/mol (Cl) = 36.461 g/mol

Now, to calculate the mass of 4 mol of HCl, we multiply the molar mass by the number of moles:
4 mol x 36.461 g/mol = 145.844 g

Therefore, the mass of 4 mol of HCl is 145.844 grams.

The molar mass of HCl is 36.46 g/mol.

Mass = moles x molar mass

Mass = 4 mol x 36.46 g/mol

Mass = 145.84 g