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A certain protein was found to contain 0.471% zinc by mass. Determine the minimum molecular mass of the protein.
The incomplete pressures of CH4, N2, and O2 in a sample of gas were found to be 100, 450, and 200 mmHg, respectively. Compute the mole fraction of Nitrogen.
What are the two pKa values for carbonic acid? What is the pH of a 0.100M solution of potassium bicarbonate. What is the pH of a 0.100M solution of potassium carbonate
If the copper is drawn into wire whose diameter is 8.20 , how many feet of copper can be obtained from the ingot? The density of copper is 8.94.
How does omitting triethanolamine affect the properties and appearances of the hand lotion
Earth's oceans have an average depth of 38000m, a total area of 3.63*10^8km^2, and an average concentration of dissolved gold of 5.8*10^-9g/L. a) how many grams of gold are in the oceans?
The normal boiling point of bromine is 58.8°C. Given that the vapor pressure of methanol is 75.0 torr at 2.5°C, calculate the molar enthalpy of vaporization of bromine.
How much heat is required to warm 1.3kg of sand from 30 degree Celsius to 100 degree Celsius? (According to my notes- specific heat capacity of sand is .84 J/(g x Celsius)
Question- A solution prepared by mixing 46.9 mL of 0.220 M AgNO3 and 46.9 mL of 0.220 M TlNO3 was titrated with 0.440 M NaBr in a cell containing a silver indicator
Question- A mixture of nitrous oxide (N2O) and O2 gas has a density of 1.86 g/L at STP. What is the composition of the mixture in mole %? hint- think about weighted averages analogous to what we do to find isotopic mass
magnesium hydroxide is used in several antacid formulations. when it is added to water it dissociates into magnesium
lutonium-239 is a byproduct of the fission reaction used to produce energy in nuclear power reactors. It has a half-life of 24,400 years. A student determines that it will take 97,600 years for the radioactivity of a Pu-239 sample to drop to one-e..
the pressure of a gas is 817 torr at 55degc. the quantity of the gas is fixed and the volume remains constant as the
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