Mass Of 1 molecule of nepthalene = 10*mass of carbon + 8* mass of hydrogen. = 10 * 12+8*1= 120+8=128 gram

Mass of 1 Molecule of Naphthalene

Naphthalene is a polycyclic aromatic hydrocarbon composed of two fused benzene rings. To calculate the mass of one molecule of naphthalene, we need to consider the atomic masses of its constituent elements and their respective ratios in the molecule.

Step 1: Determine the Chemical Formula of Naphthalene

The chemical formula of naphthalene is C10H8, which means it contains 10 carbon atoms (C) and 8 hydrogen atoms (H).

Step 2: Find the Atomic Mass of Carbon and Hydrogen

The atomic mass of carbon (C) is approximately 12.01 atomic mass units (u), while the atomic mass of hydrogen (H) is approximately 1.008 u.

Step 3: Calculate the Total Atomic Mass of Naphthalene

To determine the total atomic mass of naphthalene, we multiply the number of atoms of each element by their respective atomic masses and sum them up.

Number of carbon atoms (C) = 10
Number of hydrogen atoms (H) = 8

Total atomic mass of carbon = 10 * 12.01 u = 120.10 u
Total atomic mass of hydrogen = 8 * 1.008 u = 8.064 u

Total atomic mass of naphthalene = 120.10 u + 8.064 u = 128.164 u

Step 4: Convert Atomic Mass to Grams

To convert the atomic mass of naphthalene to grams, we use Avogadro's number, which is approximately 6.022 x 10^23 molecules per mole.

1 mole of naphthalene = 128.164 grams
6.022 x 10^23 molecules of naphthalene = 128.164 grams

Mass of 1 molecule of naphthalene = 128.164 grams / 6.022 x 10^23 = 2.13 x 10^-23 grams

Therefore, the mass of one molecule of naphthalene is approximately 2.13 x 10^-23 grams.

Summary:
- The chemical formula of naphthalene is C10H8.
- The atomic mass of carbon (C) is approximately 12.01 u, and the atomic mass of hydrogen (H) is approximately 1.008 u.
- The total atomic mass of naphthalene is calculated by multiplying the number of atoms of each element by their respective atomic masses and summing them up.
- The mass of one molecule of naphthalene is approximately 2.13 x 10^-23 grams.