Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340. gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.oC, this tank contains both CO2(g) and CO2(l). After a paintball game, the tank contains only CO2(g).Determine the total number of moles of CO2 added to the tank before it is used for paintball.
Answers
The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.
What is a mole ?
A mole of a substance is that containing 6.022 * 10^23 molecules of that substance
A 340 gm sample of carbon dioxide
Molecular weight = 44
Moles added to the tank = mass/ molecular meight
Moles added to the tank = 340 /44
= 7.73 moles
The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.
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1000 cm³ = 1 L
1 cm³ = 1 / 1000 L
508 cm³ = (1 / 1000) * 508 L = 0.5080 L
So, 508 cm³ = 0.5080 L
Now,
We know,
22.4 L = 1 mole
1 L = 1 / 22.4 mole
0.5080 L = (1 / 22.4) * 0.5080L = 0.0227 moles
So, 0.0277 moles moles of
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Answer: With a positively charged nucleus.
Explanation:
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Sodium thiosulfate is used as a reducing agent in the Kjeldahl procedure. It is used to prevent the interference of certain substances when determining nitrogen content in organic compounds.
During the digestion step of the Kjeldahl procedure, the organic sample is digested with sulfuric acid. This breaks down the organic compounds and converts the nitrogen present into ammonium sulfate. Some models may contain substances that can interfere with the next analysis. This can lead to inaccuracies in the outcomes.
Using sodium thiosulfate in the modified Kjeldahl procedure minimizes interference from certain compounds. The accuracy of the nitrogen determination is improved. This helps us to ensure that the results obtained are correct and instance of the actual nitrogen content in the sample.
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Final answer:
The role of Sodium thiosulfate in the modified Kjeldahl procedure is to act as a reducing agent and prevent interference from certain substances, such as nitrites and oxidizing agents, which can affect the accuracy of the nitrogen content determination in organic compounds.
Explanation:
In the modified Kjeldahl procedure, Sodium thiosulfate (Na2S2O3) plays a crucial role as a reducing agent. This procedure is commonly used for the determination of nitrogen content in organic compounds. The addition of Sodium thiosulfate to the reaction mixture serves to prevent interference from certain substances that can react with the reducing agent used in the procedure.
When performing the modified Kjeldahl procedure, it is important to accurately determine the nitrogen content in the sample. However, certain substances, such as nitrites and other oxidizing agents, can interfere with the reaction and affect the accuracy of the results. These interfering substances can react with the reducing agent, leading to inaccurate measurements.
By adding Sodium thiosulfate to the reaction mixture, these interfering substances are neutralized. Sodium thiosulfate acts as a reducing agent, effectively preventing the interference of nitrites and other oxidizing agents. This allows for a more accurate determination of the nitrogen content in the sample.
Learn more about role of sodium thiosulfate in modified kjeldahl procedure here:
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Answers
The answer is C just got it right
Answers
= 952 g (NH4)2CO3 / 1750 mL x 100
= 0.544 x 100
(%m/v) = 54.4 g /mL or 54.4% concentration of ammonium carbonate
solution