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MileenaKitana
21.01.2020 •
Chemistry
What is the balanced chemical equation for the reaction of sodium and oxygen
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Ответ:
Explanation:
Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation: 4 Na + O2 --> 2 Na20
Ответ:
The partial pressure of Ar = 0.925 atm
The partial pressure of Kr = 0.381 atm
The total pressure = 1.306 atm
Explanation:
Step 1: Data given
Mass of Ar = 3.78 grams
Mass of Kr = 3.27 grams
Volume = 2.50 L
Temperature = 25.0 °C
Molar mass of Ar = 39.95 g/mol
Molar mass of Kr = 83.80 g/mol
Step 2: Calculate moles of Ar
Moles Ar = mass Ar / molar mass Ar
Moles Ar = 3.78 grams / 39.95 g/mol
Moles Ar = 0.0946 moles
Step 3: Calculate moles of Kr
Moles Kr = 3.27 grams / 83.80 g/mol
Moles Kr = 0.039 moles
Step 4: Calculate partial press of each gas
p*V = n*R*T
⇒ p =the partial pressure of the gas
⇒ V = the volume in the container = 2.50 L
⇒ n = the number of moles of the gas
⇒ R = the gasconstant = 0.08206 L*atm/K*mol
⇒ T = the temperature = 25°C = 298 K
The partial pressure of Ar = (n*R*T)/V
p(Ar) = (0.0946*0.08206*298)/ 2.5
p(Ar)= 0.925 atm
p(Kr) = (0.039*0.08206*298)/ 2.5
p(Kr) = 0.381 atm
Step 5: Calculate the total pressure
The total pressure = p(Ar) +p(Kr)
Total pressure = 0.925 atm + 0.381 atm = 1.306 atm