a mothball composed of naphthalene has a mas of 1.06g. how many napthalene molecules does it contain
How many moles of naphthalene do you have? That's grams/molar mass.
Now remember there are 6.02E23 molecules in 1 mole of any material.
To determine the number of naphthalene molecules in a mothball, we'll need to use the concept of Avogadro's number and the molar mass of naphthalene.
1. First, find the molar mass of naphthalene (C₁₀H₈).
- Carbon (C) has a molar mass of 12.01 g/mol, and there are 10 carbon atoms in naphthalene.
- Hydrogen (H) has a molar mass of 1.01 g/mol, and there are 8 hydrogen atoms in naphthalene.
Molar mass of naphthalene = (10 × 12.01 g/mol) + (8 × 1.01 g/mol)
= 128.17 g/mol
2. Calculate the number of moles of naphthalene in the mothball using the given mass.
Moles = Mass / Molar mass
= 1.06 g / 128.17 g/mol
3. Apply Avogadro's number, which states that one mole of any substance contains 6.022 × 10²³ particles (atoms, molecules, etc.).
Number of molecules = Moles × Avogadro's number
= (1.06 g / 128.17 g/mol) × (6.022 × 10²³ molecules/mol)
By performing these calculations, you can determine the number of naphthalene molecules in the mothball.