The nitrogen content of organic compounds can be determined by the Dumas method. The compound in question is first reacted by passage over hot CuO( s ): Compound → CuO( s ) Hot N 2 ( g ) + CO 2 ( g ) + H 2 O ( g ) The product gas is then passed through a concentrated solution of KOH to remove the CO 2 . After passage through the KOH solution, the gas contains N 2 and is saturated with water vapor. In a given experiment a 0.253-g sample of a compound produced 31.8 mL N 2 saturated with water vapor at 25°C and 726 torr. What is the mass percent of nitrogen in the compound? (The vapor pressure of water at 25°C is 23.8 torr.)
The nitrogen content of organic compounds can be determined by the Dumas method. The compound in question is first reacted by passage over hot CuO(s):
Compound
→
CuO(
s
)
Hot
N
2
(
g
)
+
CO
2
(
g
)
+
H
2
O
(
g
)
The product gas is then passed through a concentrated solution of KOH to remove the CO2. After passage through the KOH solution, the gas contains N2 and is saturated with water vapor. In a given experiment a 0.253-g sample of a compound produced 31.8 mL N2 saturated with water vapor at 25°C and 726 torr. What is the mass percent of nitrogen in the compound? (The vapor pressure of water at 25°C is 23.8 torr.)
Nitrate salts are generally soluble, but as you have learned, nothing has infinite solubility. Barrium nitrate is one of the least soluble nitrate salts. Consider the following data:
Ba2+(aq) ΔGf° = –561 kJ/mol
NO3 – (aq) ΔGf° = –109 kJ/mol
Ba(NO3)2(s) ΔGf° = –797 kJ/mol
Use the above data to calculate the maximum solubility (in g/L) of Ba(NO3)2 in water under STP
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures
13.0cm wide and 15.6cm high. The maximum safe pressure inside the vessel has been measured to be 3.60MPa. For a certain reaction the vessel may contain up to
0.0457kg
of carbon dioxide gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Be sure your answer has the correct number of significant digits.
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 43.0cm wide and 51.6cm high. The maximum safe pressure inside the vessel has been measured to be 6.90MPa.For a certain reaction the vessel may contain up to 5.26kg of dinitrogen difluoride gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Be sure your answer has the correct number of significant digits.
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