Which sample of gas will have molecules with the highest average kinetic energy at 385 K? N2 N20 They all have the same average kinetic energy.

7. When detern ing the mass of a liquid, ras in a hurry and did not allow enough time for the temperature of the flask to reach the temperature of the boiling water bath. The student recorded the temperature of the gas as 100.0°C when it was only 80.0°C, Is the molar mass calculated by the student higher or lower than the accepted molar mass, or does this error have no effect on the calculated result? Briefly explain your answer # 2/HB Office DEPOTS b) If the student assumed the volume of the flask was 125 mL (as marked by the side of the flask) rather than measuring the volume experimentally, would the unknown's calculated molar mass be too high, too low, or unaffected? Explain. # 2/HB 4

Calculate the average kinetic energy, in J/mol, for a mole of CH₄ at -23.0 °C. Assume ideal gas behavior.

1. The formation of gaseous phosphorus trichloride is shown below:   P4 (g) + 6 Cl2 (g) → 4 PCl3 (g)     ΔH = -1207 kJ/mol   If 4.30 kJ of heat are released as the formation reaction above proceeds, how many milliliters of gaseous phosphorus trichloride, measured at 35°C and 712 torr, will be produced?

What is kinetic energy of one mole of an ideal gas st 25C?

1. A 1.0L flask contains equal amounts of O2 and CO2 at 25°C.   a. Which molecules have the greater average speed or are they the same? b. Which molecules have the greater average kinetic energy or are they the same?

Ancient Romans built often out of bricks and mortar. A key ingredient in their mortar was quicklime (calcium oxide), which they produced by roasting limestone (calcium carbonate). 1. Write a balanced chemical equation, including physical state symbols, for the decomposition of solid calcium carbonate (CaCO2) into solid calcium oxide and gaseous carbon dioxide. C 2. Suppose 86.0 L of carbon dioxide gas are produced by this reaction, at a temperature of 260.0 °C and pressure of exactly 1 atm. Calculate the mass of calcium carbonate that must have reacted. Round your answer to 3 significant digits.

Constant is 4.184