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A flammable gas made up only of carbon and hydrogen is found to effuse through a small hole in 1.50 min. Under the same conditions of temperature and pressure it takes an equal volume of bromine vapor 4.74 min to effuse through the same hole. Calculate the molar mass of the unkown gas and suggest what this gas might be.
you have a hydrochloric acidsolution with a pH of 1.8. How many mL of sodium hydroxide with a pH of 11.8 would be used to neutralize 20.0 mL of the acid solution.
How many different types of resonance structures can be drawn for the ion SO32.
What is the bond order of a molecule with 10 valence electrons 12valence electrons,13 valece electrons,14 valence electrons
A piece of metal of mass 20 g at 99?C is placed in a calorimeter containing 55.8 g of water at 23?C. The final temperature of the mixture is 30.4?C.
which of the following alkyl halides reacts most rapidly via SN1 solvolysis reaction in hot methanol? A) 1-iodo-1-methylcyclohexane
The carboxylate groups in sugammadex play an important binding role in locking rocuronium into the central cavity of the cyclodextrin, but they also have an important role in allowing the drug access to the cavity.
What is the pH of a solution that is 0.75 M in sodium acetate and 0.50M in acetic acid? (Ka for acetic acid is 1.85 x 10-5).
Calculate the molarity of a Ca(OH)2 solution if it takes 25.0 mL to titrate 0.650 g of KHP in a standardization titration. (KHP has one H+ and a formula weight of 204.2 g/mol.)
The equilibrium pressure is measured as 0.8 atm. What is the molecular weight of the gas? 1. 138.5 g · mol?1 2. 12.5 g · mol?1 3. 3.6 g · mol?1 4. 45 g · mol?
The osmotic pressure of a aqueous solution of a given polymer with mass concentration 0.300 g/mL is 10.0 torr at 298 K. Estimate the molar mass of the polymer.
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
What types of limitations and obstacles must any plausible origin of life scenario overcome, and why did Crick believe life couldn't have formed on Earth?
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