Question

1. most gas grills use propane gas. the formula for propane is c₃h₈. what is this formula? i. a chemical formula ii. a molecular formula iii. an empirical formula

Explanation:

A chemical formula shows the elements in a compound and the relative proportions of each element. A molecular formula gives the exact number of each type of atom in a molecule. For propane (\(C_3H_8\)), there is no simpler whole - number ratio of \(C\) and \(H\) atoms (since \(3\) and \(8\) have no common divisor other than \(1\)). So, \(C_3H_8\) is both a chemical formula and a molecular formula. It is not an empirical formula (because an empirical formula is the simplest whole - number ratio of atoms in a compound, and \(C_3H_8\) is already in its simplest ratio for this molecule, but the definition of empirical formula is for the general case of finding the simplest ratio, and here \(C_3H_8\) satisfies the chemical formula and molecular formula definitions).

Answer:

C. I and II