Question

When there is multiple molecules, it represented by a coefficient (stoichiometric coefficient). If we have 2 molecules of the crude oil in question one, it would be written like this; 2C8H18. The leading number(2) is the coefficient. Remember the whole molecule is multiplied by the coefficient (2). What is the molar mass of 2C8H18?

Answer 1

The molar mass of 2 molecules of octane (2C8H18) is 228.448 g/mol, calculated by doubling the molar mass of a single molecule of octane (114.224 g/mol).

Step-by-step explanation:

The molar mass of a compound is the mass of one mole of that substance. The molar mass of octane (C8H18) is calculated by summing the atomic masses of all the atoms in the formula. Since octane consists of 8 carbon atoms and 18 hydrogen atoms, we calculate the molar mass as follows:

• Molar mass of Carbon (C) = 12.01 g/mol
• Molar mass of Hydrogen (H) = 1.008 g/mol

So, the molar mass of a single molecule of octane (C8H18) is:

(8 × 12.01 g/mol) + (18 × 1.008 g/mol) = 96.08 g/mol + 18.144 g/mol = 114.224 g/mol

Since we are asked for the mass of 2 molecules of octane (2C8H18), we simply multiply the molar mass of one molecule of octane by 2:

2 × 114.224 g/mol = 228.448 g/mol

Therefore, the molar mass of 2 molecules of octane is 228.448 grams per mole.