How many hydrogen atoms are contained in 1.50 g of glucose (C₆H₁₂O₆)?
3.01 × 10²²
1.20 × 10²³
2.40 × 10²³
6.02 × 10²²
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-2 – 2017
Number of moles of glucose = mass / molar mass = 1.50 g / 180 g/mol ≈ 0.00833 moles.
One molecule of glucose (C₆H₁₂O₆) contains 12 hydrogen atoms. Therefore, one mole of glucose contains 12 moles of hydrogen atoms.
Number of moles of hydrogen atoms = 0.00833 mol glucose × 12 mol H atoms/mol glucose = 0.1 moles of hydrogen atoms.
Number of hydrogen atoms = moles of H atoms × Avogadro’s number (6.022 × 10²³ atoms/mol) = 0.1 mol × 6.022 × 10²³ atoms/mol ≈ 0.6022 × 10²³ atoms = 6.022 × 10²² atoms.