Final answer:
To find the mass of HCl and I2, multiply their respective moles by their molar masses. For HCl, the calculation is 12.0 moles multiplied by 36.46 g/mol, yielding 437.52 grams. For I2, 7.00 moles multiplied by the molar mass of two iodine atoms (2 x 126.90 g/mol) equals 1776.6 grams.
Step-by-step explanation:
To calculate the mass in grams of 12.0 moles of hydrogen chloride (HCl), we use its molar mass, which is 36.46 grams per mole. The calculation would then be:
Mass of HCl = 12.0 moles × 36.46 g/mol = 437.52 grams
For 7.00 moles of iodine (I2), the molar mass is the sum of two iodine atoms, which is roughly 126.90 grams per mole for each iodine atom, resulting in:
Mass of I2 = 7.00 moles × (2 × 126.90 g/mol) = 1776.6 grams
Always ensure that your final answers reflect the correct number of significant figures as provided in the initial values.