Final answer:
To calculate the molecular mass of a compound such as CHCl3, multiply each element's quantity by its average atomic mass and sum the subtotals, resulting in 119.37 amu for CHCl3 and 58.44 amu for NaCl.
Step-by-step explanation:
The student's question pertains to the calculation of molecular mass or formula mass using values in a table that displays elements, their quantity, and their average atomic mass. To find the molecular mass of a compound such as CHCl3, you would multiply the quantity of each element (shown in the second column) by the element's average atomic mass (fourth column) and sum the subtotals to get the molecular mass. For example, the molecular mass of CHCl3 to two decimal places is 119.37 amu and of NaCl is 58.44 amu. The process leverages simple multiplication and addition based on the formula laid out in the table.