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liamhallowell28
23.12.2020 •
Chemistry
What mass of zinc will completely react with 18.9 L of oxygen gas at 15°C and 1.50 atm pressure to produce zinc oxide. Remember to write a balanced. equation and fill in what is needed to answer this question on the BCA table.
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Ответ:
Mass of zinc react with oxygen = 156.91 g
Explanation:
Given data:
Volume of oxygen = 18.9 L
Temperature = 15°C
Pressure = 1.50 atm
Mass of zinc react with oxygen = ?
Solution:
Chemical equation:
2Zn + O₂ → 2ZnO
Number of moles of oxygen:
PV = nRT
1.50atm ×18.9 L = n× 0.0821 atm.L / mol.K × 288 K
28.35 atm.L = n× 23.64atm.L / mol
n = 28.35 atm.L / 23.64atm.L / mol
n = 1.2 mol
Now we will compare the moles of oxygen and Zn.
O₂ : Zn
1 : 2
1.2 : 2/1×1.2 = 2.4 mol
Mass of zinc required:
Mass = number of moles × molar mass
Mass = 2.4 mol × 65.38 g/mol
Mass = 156.91 g
Ответ: