how many atoms of H are ther in 4.3g CH4
To determine the number of hydrogen (H) atoms in 4.3 grams of CH4 (methane), we need to follow these steps:
Step 1: Find the molar mass of CH4
The molar mass of CH4 is calculated by summing up the atomic masses of each atom in the molecule:
C (carbon) = 12.01 g/mol
H (hydrogen) = 1.008 g/mol (since there are 4 hydrogen atoms in CH4)
Molar mass of CH4 = (1 × 12.01 g/mol) + (4 × 1.008 g/mol) = 16.04 g/mol
Step 2: Determine the number of moles of CH4
Using the equation:
moles = mass / molar mass
moles of CH4 = 4.3 g / 16.04 g/mol ≈ 0.268 mol
Step 3: Calculate the number of moles of hydrogen (H) atoms
Since there are 4 hydrogen atoms in one CH4 molecule, the number of moles of hydrogen (H) atoms is multiplied by 4:
moles of H = 0.268 mol CH4 × 4 mol H/1 mol CH4 = 1.072 mol H
Step 4: Convert moles of H to the number of atoms
To convert moles to the number of atoms, we use Avogadro's constant:
1 mol = 6.022 × 10^23 atoms
number of H atoms = 1.072 mol H × 6.022 × 10^23 atoms/mol ≈ 6.46 × 10^23 atoms
Therefore, there are approximately 6.46 × 10^23 hydrogen (H) atoms in 4.3 grams of CH4.