Final answer:
To determine the formula mass of a compound such as NaCl or CHCl3, multiply the quantity of each element by its average atomic mass and sum the resulting values to obtain 58.44 amu for NaCl and 119.37 amu for CHCl3.
Step-by-step explanation:
The question involves calculating the formula or molecular mass of chemical compounds, which is a topic in Chemistry. To calculate the formula mass of NaCl and CHCl3, for example, it is necessary to multiply the quantity of each element by its average atomic mass and then sum the subtotals. For instance, NaCl has one atom of sodium (Na) and one atom of chlorine (Cl), with atomic masses of 22.99 amu and 35.45 amu respectively. Thus the formula mass for NaCl is 22.99 amu (for Na) + 35.45 amu (for Cl) = 58.44 amu. Similarly, for the compound CHCl3, which has one carbon (C), one hydrogen (H), and three chlorine (Cl) atoms, the formula mass is found by adding up 12.01 amu (for C) + 1.008 amu (for H) + 3 * 35.45 amu (for Cl), which equals 119.37 amu.