what is the mass of hydrogen in a sample of c7h6o3 with mass of 6.84 g?
回答 (1)
2018-04-04 3:19 pm
Mass of 1 mole of C₇H₆O₃ = (12.0×7 + 1.0×6 + 16.0×3) g = 138.0 g
Mass of H in 1 mole of C₇H₆O₃ = 1.0×6 g = 6.0 g
Mass fraction of H in C₇H₆O₃ = 6.0/138.0
Mass of H in 6.84 g of C₇H₆O₃ = (6.84 g) × (6.0/138.0) = 0.297 g ≈ 0.30 g (to 2 sig. fig.)
Mass of H in 1 mole of C₇H₆O₃ = 1.0×6 g = 6.0 g
Mass fraction of H in C₇H₆O₃ = 6.0/138.0
Mass of H in 6.84 g of C₇H₆O₃ = (6.84 g) × (6.0/138.0) = 0.297 g ≈ 0.30 g (to 2 sig. fig.)
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