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Explain why it is necessary to cinsider water vapor pressure in calculating the atomic mass of an unknown metal. Whould the calculated atomac mass be larger or smaller thatn the true value if water vapor pressure was ignored?
When 24 mL of a 175 mL stock solution containing 1.6 M BaF2 is diluted to 70 mL, what is the concentration of Ba2+ in the new solution?
A rock contains 0.42 mg of Pb-206 and 0.53 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for 238U-->206Pb is 4.5x10^9 yr.
if a molecule of a neon gas travels at an average of 400.m/s at a given temperature, estimates the average speed of a molucule of butane gas, C4H10, at the same temperature.
A nitric acid solution containing 71% HNO3 (by mass) has a density of 1.42g/mL. how many moles of HNO3 are present in 1.00L of this solution.
a coffee contains 100 mL of H2O. initial temperature of calorimeter is temperature 23 C.if 8.20 g of CaCl2 is added to calorimeter. what will be the final temperature of the solution in the calorimeter.
The ground water in Pherric, New Mexico contains 1.80 mg/L of iron as Fe+3. What pH is required to precipitate all but 0.30 mg/L of the iron as Fe(OH)3 at 25oC?
We have a refrigeration unit that works at a pressure of 0.1MPa in the evaporator and 1 MPa in the condenser. The refrigeration unit uses a compressor with an efficiency of 90% and a turbine with 100% efficiency is used to expand the refrigerant a..
A laboratory procedure calls for making 570.0mL of a 1.6M KNO3 solution. How much KNO3 in grams is needed
what is the global pH change incurred after injection of the HCl? What would the pH change be if the same amount of 1.000 M HCl were put into a gallon of pure water?
laws of thermodynamics. Why is there no law for the conservation of entropy?
a sample of He gas has a volume of 900 mL and a pressure 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 336 K and the volume is decreased to 450 mL?
In a reaction that is first-order with respect to reactant A and second-order with respect to reactant B, what will happen to the rate of the reaction if we
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