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
clear all
i only
i, ii, and iii
i and ii
ii only

Explanation:

• A chemical formula is a general term that can refer to both molecular and empirical formulas.
• A molecular formula shows the exact number of atoms of each element in a molecule. For propane (\(C_3H_8\)), it is a molecular formula because it represents the actual number of carbon (\(C\)) and hydrogen (\(H\)) atoms in a propane molecule.
• To check if it is also an empirical formula, we find the simplest whole - number ratio of atoms. For \(C_3H_8\), the ratio of \(C:H = 3:8\), and 3 and 8 have no common factors other than 1. So, \(C_3H_8\) is also an empirical formula.

Answer:

I, II, and III