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A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 70.0 g gram sample of chemical X should contain how many grams of nitrogen?
Propose structures for aromatic hydrocarbons that meet the following descriptions:
What must be the concentration of PO43- to just start precipitation of Ag3PO4 in a 0.10M AgNO3 solution?
In dilute solution the carbonyl absorption band of II occurs at 1702/cm. Explain this observation. stretching vibration in carboxylic acids is heavily mixed
What is the formula weight of CuI?
A 1.20 M solution of citric acid (H3C6H5O7) in water has a density of 1.10 g/cm3. Calculate the normality. Citric acid has three acidic protons.
The volume of a sample of a gas at 273 degrees Celsius is 200.0 L. if the volume is decreased to 100.0 L at constant temperature, what will be the new temperature of gas?
during exercise a person breathes in between 100 and 200 L of air er minute. if a person is exercising enough to breathe in an average of
calculate the molality of this solution (in mol solute/kg solvent).
the freezing point of the solution is lowered by 5.71 °C. The freezing point and Kf constant for cyclohexane can be found here. Calculate the molar mass of menthol.
Using a sample of 30.0 mL of Kr(g), is at 25°C and 756 mmHg. Calculate the new volume if the temperature is decreased to -125°C and pressure is decreased to 325 mmHg .
A researcher conducts an experiment to determine the work function of a palladium surface. She fires a laser with a wavelength of 254 nm at a certain time and observes electrons hitting a detector
A helium-filled weather balloon has a volume of 714 L at 23 oC and 759 mmHg. It is released and rises to an altitude of 4.80 km, where the pressure is 495 mm Hg and the temperature is -9oC. what is the volume of the balloon at this altitude.
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