Question

Calculate the total number of hydrogen atoms in 2 moles of benzene, C6H6. Give the answer to 3 significant figures ___.___ ___ × 1024 (the × 1024 is not required in the answer). L = 6.02 × 1023

Answer 1

Answer:

7.22

Explanation:

2 moles of benzene would contain 6*2 moles of h2 atoms

implies that 2moles C6H6 contain 12*6.02*10²³ atoms of hydrogen which makes it 7.224*10²⁴

Answer 2

• The answer in 3 significant figures is 7.22
• 1 molecule of benzene has 6 hydrogen atoms.

         ⇒ 1 mole of benzene ≈ 6 * 6.02 * 10²³ hydrogen atoms

• Therefore, 2 moles of benzene ≈ 12 * 6.02 * 10²³ hydrogen atoms = 7.224 * 10²⁴ H-atoms.