You have 15.5 g of oxalic acid, h2c2o4. what amount is represented by 15.5 g of oxalic acid? how many molecules of oxalic acid are in 15.5 g? how many atoms of carbon are in 15.5 g of oxalic acid?

Question

Alexandria

Chemistry

7 March, 03:18

You have 15.5 g of oxalic acid, h2c2o4. what amount is represented by 15.5 g of oxalic acid? how many molecules of oxalic acid are in 15.5 g? how many atoms of carbon are in 15.5 g of oxalic acid?

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Answers (1)

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Desiree Hester · Answer 1

a) m (H₂C₂O₄) = 15.5 g.

n (H₂C₂O₄) = m (H₂C₂O₄) : M (H₂C₂O₄).

n (H₂C₂O₄) = 15.5 g : 90 g/mol.

n (H₂C₂O₄) = 0.172 mol; amount of substance.

N (H₂C₂O₄) = n (H₂C₂O₄) · Na (Avogadro constant).

N (H₂C₂O₄) = 0.172 mol · 6.022·10²³ 1/mol.

N (H₂C₂O₄) = 1.037·10²³; number of molecules.

b) In one molecule of oxalic acid there are two atoms of carbon:

N (C) = 2 · N (H₂C₂O₄).

N (C) = 2 · 1.037·10²³.

N (C) = 2.074·10²³; number of carbon atoms.