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A solution of salt water raised the boiling point of water from 100°C to 102.5°C. What is the molality of the solution? Assume Kb of water is 0.51°C/m.
In an organic molecular solid, the "free state" mobility of photoinjected holes at room temperature is 0.4 cm²/Vs. Due to a small concen tration of traps at a concentration of 1 part in 108, each having a trap depth of 0.4 eV, the observed mobility is much smaller than this. What is the observed mobility at 250 K? 300 K? 350? What is the characteristic temperature below which one might consider the mobility to be "trap limited"?
A compound containing only nitrogen and oxygen is
63.64% N by mass the empirical formula of the
compound is
What is the
A chlorine oxide is 59.7%% by mass CI What is the
empirical formula of the oxide?
A chlorine oxide is 59.7%% by mass CI What is the
empirical formula of the oxide?
Will AgIO3 precipitate when 20 mL of 0.010M AgIO3 is mixed with 10 mL of 0.015M NaIO3? Ksp of AgIO3 is 3.1× 10-8
The vapor pressure of water at 25 ºC is 23.8 mmHg. What is the vapor pressure of a solution containing 5.50 g of nonelectrolyte sucrose (MWsucrose= 342 g/mol) in 12.8 g of water (MWwater= 18.0 g /mol) at 25.0 °C
Balance this chemical equation
C3 H8 +O2 - CO2 + H2O
A sample of 0.892 g of potassium chloride (KCl) is dissolved in 54.6 g of water (H2O). Determine the percent mass of KCl in the solution and its molality if the molar mass of KCl is 74.5513 grams
per mole.
CH4 + 2O2 = CO2 + 2H2O
How many grams of O2 is needed to produce 37.5 g of CO2.
30.0 g H2O at an unknown temperature is mixed with 27.0 g of water at 15.8oC in a coffee-cup calorimeter. If the final temperature of the mixture is 29.1oC, what is the initial temperature of the water?
