CDS 2017 PYQ with Answer — How many hydrogen atoms are contained in 1.50 g of glucose (C₆H₁₂O₆) ?

2017 · Q18

How many hydrogen atoms are contained in 1.50 g of glucose (C₆H₁₂O₆) ?

General KnowledgeChemistry

A3.01 × 10²²
B1.20 × 10²³
C2.40 × 10²³
D6.02 × 10²²

Explanation

Glucose (C₆H₁₂O₆) has a molar mass of 180 g/mol, so 1.50 g corresponds to 1.50/180 = 1/120 mol, about 0.00833 mol. Each glucose molecule contains 12 hydrogen atoms, giving 12/120 = 0.1 mol of hydrogen atoms. Multiplying by Avogadro's number (6.022×10²³) yields 0.1 × 6.022×10²³ = 6.02×10²² hydrogen atoms.