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A sample of an unknown gas effuses in 10.1 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.16 min. What is the molar mass of the unknown gas?
Explain the following: a.) The cycloheptatrienyl anion is antiaromatic, whereas the cyclononatetraenyl anion is planar (in spite of the angle stain involved) and appears to be aromatic. b.) Although
How would the following modifications of the experimental procedure used in this experiment affect the mass of the precipitate collected? Indicate whether the mass would be greater than, unchanges, or less than that obtained. Briefly explain the a..
Use the stoichimetery of the equation and the dilute titanium 4 chloride solution for the following: How many moles of solid product can be formed?
a solid sample containing some Fe+2 ion weighs 1.062g. It requires 24.12mL 0.01562 M KMnO4 to titrate the Fe+2 in the dissolved sample to a pink end point.
How many moles of chloroform, CHCl3, are required to fill a 253-mL flask at 100.0°C and 940 torr?
To identify a diatomic gas (X2), a researcher carried out the following experiement. She weighed an empty 4.2L bulb, then filled it with the gas at 1.30atm and 23.0C and weighted it again. The difference in mass was 6.3 g. Identify the gas
A chemist prepares a sample of hydrogen bromide and finds that it occupies 252 mL at 70C and 464 Torr. What volume would it occupy at 0C at the same pressure.
Which of the following statements are true regarding the liquid-liquid extraction performed in the synthesis of phenacetin. Note that there may be more than one correct answer. Dichloromethane is the bottom layer because it is more dense than water..
Suppose you were given a pure stereoisomer that rotated the plane polarized light either +60 degrees or -120 degrees, i.e a uniform colour is observed for both of these readings.
copper-64 is used to study brain tumors. assume that the original mass of a sample of copper-64 is 26.00g. After 64 hours, all that remains is 0.8125g of copper-64. What is the half-life of this radioactive isotope?
Assume that the pH is low enough that CH3COOH is not dissociated at all and that the activity of water equals 1 just like for pure liquid water (after all, the solution is quite dilute). HINT: This problem requies you to keep and extra large numbe..
An inventor designs a new heat engine that can be modeled on the Carnot cycle. The working gas in the heat engine is 1 mole of helium. The isothermal expansion results in the internal volume changing from 1 L to 3 L
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