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Gallium is a metal with a wide variety of uses. Some of its applications include computer memory chips, light emitting diodes and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors. Naturally occurring gallium consists of two isotopes. One of those isotopes is 71Ga with an isotopic mass of 70.9247050 amu and an abundance of 39.892%. What is the mass number of the other isotope
the concentration of carbon monoxide in a sample of air is 9.2 ppm. there are how many molecules of CO are in 1 liter of 755 torr and 23 degrees celcius
Calorimetry is a method used to measure enthalpy, or heat, changes that occur during chemical processes. Two common calorimeters are constant-pressure calorimeters and constant-volume (or "bomb") calorimeters
A chemist wanted to determine the concentration of a solution of lactic acid, HC3H5O3. She found that the pH of the solution was 2.49. What was the concentration of the solution
upon catalytic hydrogenation unknown Z gives cyclooctane. Oxonolysis of Z followed by reduction with dimethyl sulfide, gives a three0carbon dialdehyde and a five-carbon dialdehyde. Draw the stucture of Z.
A mixture of 0.10 mol of NO(g), 0.05 mol of H2(g), and 0.10 mol of H2O(g) is placed in a 1.0-L vessel at 300K?
A sample of hydrogen gas collected at STP occupies a volume of 31.6 L. How many moles of gas does the sample contain? answer in mol please
volume of methane gas is cooled from 298 K to 149 L. If the pressure remains constant, what is the final volume?
If 15 grams of copper(2) chloride react with 20grams of sodium nitrate, how much sodium chloride can be formed
They will dilute the 0.5 M solution to obtain 100 mL of 0.15M solution and dilute the 0.5m solution to obtain 10,000 ppm per mass. What is the molarity, molality, mass fraction and mole fraction
Dry the hydrate as instructed in the lab procedure, noting down it's mass until it appears to no longer decrease (no more water bound in the sample).
What is the ground state electron configuration for the boron atom? What term symbols can arise from this electron configuration?
Hexane has a vapor pressure of 100 torr at 15.8 C and 400 torr at 49.6 C. What is its deltaHvap
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