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To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. A chemical engineer places a mixture of noble gases consisting of 6.18 g of He, 14.9 g of Ne, and 34.9 g of Kr in a piston-cylinder assembly at STP. Calculate the partial pressure of each gas.
How many grams of phosphorus react with 35.8 L of O2 at STP to form tetraphosphorus decaoxide?P4(s) + 5 O2(g) --------P4O10(s)
calculate the mass of urea that should be dissolved in 187 g of water at 35c to produce a solution with vapor pressure
How much heat is absorbed in the formation of 1.69 mol of NO? Answer units KJ
A molecule having a molar mass of 190.3 g/mol crystallizes to a cubic solid where each edge of the unit cell is 638.0 pm. Each unit cell contains 2 molecules. What is the bulk density of the crystal
A basketball with a volume of 3.50 Liters is left in a car when the temperature is 298 K. What will the volume of the ball be as the car heats up to 305 K during the day?
Write a balanced equation for the reaction between O2 and H2. ( I know its H2O but I want to make sure there is nothing left over from O2)
A 6.11g sample of Cu-?Zn alloy reacts with excess aqueous HCl producing 1.26 L of H2(g) at 22.0 ?C and 728 torr. Since only the Zn portion of the alloy reacts, calculate the percent Cu in the alloy.
Calculate the pH in the solution formed by adding 10.0 mL of 0.100 M HCl to 20.0 mL of 0.100 M NH3
The half life of a first-order reaction was found to be 439 s; what is the time constant for the reaction
A 4.61*10^-3 mole sample of HY is dissolved in enough H20 to form .086L of solution. If the pH of the solution is 2.64, what is the K_a of HY
the peptide Phe-Val-Lys-Ser using the appropriate protease in a phosphate buffer solution at pH=7. What two species would actually constitute the phosphate buffer?
Write a general formula to represent the chemical composition of fats and oils. How do they differ from one another
The volume of a gas is 2.50 L, measured at 1.00 atm. What is the pressure of the gas in mmHg if the volume is changed to 9.41 L
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