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sydneyclack
16.01.2020 •
Chemistry
How many molecules are in 45.98 mm of hcl assume stp
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Ответ:
A. C₃H₄N
Explanation:
Firstly, we need to calculate the no. of moles of C, H, and N using the relation:no. of moles = mass/molar mass.
∴ no. of moles of C = mass/molar mass = (90.0 g)/(12.0 g/mol) = 7.5 mol.
∴ no. of moles of H = mass/molar mass = (11.0 g)/(1.0 g/mol) = 11.0 mol.
∴ no. of moles of N = mass/molar mass = (35.0 g)/(14.0 g/mol) = 2.5 mol.
We should get the mole ratio of each atom by dividing by the lowest no. of moles (2.5 mol of N).∴ the mole ratio of C: H: N = (7.5 mol/2.5 mol): (11.0 mol/2.5 mol): (2.5 mol/2.5 mol) = (3: 4.4: 1) ≅ (3: 4: 1).
So, the empirical formula is: A. C₃H₄N.