Question

1 pts
empirical formulas are formulas representing the relative numbers of a compounds elements in the form of the __________ of atoms present.
o fractional ratios
o exponential ratios
o explicit numbers
o smallest whole number ratios

question 19
1 pts
determining the absolute numbers of atoms that compose a single molecule of a covalent compound requires knowledge of both its____________ and its _____________.
o isotopic abundance, molecular stability
o empirical formula, molecular mass
o ionic charge, solubility
o nuclear charge, isotopic abundance

Explanation:

• For the first question:
• The empirical formula represents the relative numbers of a compound's elements in the form of the smallest whole - number ratios of atoms present. Fractional ratios are not in the simplest form for an empirical formula. Exponential ratios are not relevant here. Explicit numbers would be the molecular formula (if it is the same as the empirical formula, but generally, the key is the ratio).
• For the second question:
• To find the molecular formula (which gives the absolute numbers of atoms in a covalent compound), we use the formula \(n=\frac{\text{molecular mass}}{\text{formula mass (from empirical formula)}}\). Then we multiply the sub - scripts in the empirical formula by \(n\). Isotopic abundance, molecular stability, ionic charge, solubility, and nuclear charge are not directly used in this calculation.

Answer:

• First question: smallest whole number ratios
• Second question: empirical formula, molecular mass