calculate number of moles, molecules and total atoms in 18 gm of glucose also show the calculation of its molar mass ?
Answers
Answer:
Number of moles = 0.1 mole
Number of molecules = 6.022 × 10²² molecules
Total number of atoms = 1.44528 × 10²⁴ atoms
Explanation:
The chemical formula of glucose is C₆H₁₂O₆
We know that,
Mass of 1 C-atom = 12g
Mass of 1 H-atom = 1g
Mass of 1 O-atom = 16g
Hence,
Molar mass of glucose
= Mass of 6 C-atoms + Mass of 12 H-atoms + Mass of 6 O-atoms
= (12×6) + (1×12) + (16×6)
= 72 + 12 + 96
= 180g
Given mass = 18g
We know that,
Number of moles = Given mass / Molar mass
Substituting the values we get,
Number of moles = 18 / 180
Number of moles = 1 / 10
Number of moles = 0.1 mole
We also know that,
Number of moles = Number of molecules / Avogadro number
Number of molecules = Number of moles × Avogadro number
Number of molecules = 0.1 × 6.022 × 10²³
Number of molecules = 6.022 × 10²²
We know that,
1 molecule of glucose contain 6 C-atom, 12 H-atom and 6 O-atoms
Hence,
total atoms in 1 molecule = 6 + 12+ 6
= 24 atoms
Therefore,
Total number of atoms in 18g glucose = 24 × 6.022 × 10²²
= 144.528 × 10²²
= 1.44528 × 10²⁴