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Suppose that the substance studied in the lab is 62.1% carbon, 27.6% nitrogen and 10.3% hydrogen. Determine the molecular formula for the compound.Experimentally I determined the compound to be around 69g/mol, though the experiment had a high amount of experimental error, other lab groups had values all the way up to around 80g/mol. I know to determine the molecular formula, first the empirical formula must first be determined.
A stock solution is prepared by adding 20 mL of 1.31 M AlCl3 to enough water to make 74 mL. What is the Al3+ concentration of 45 mL of the stock solution?
A solution that is made by combining 125mL of 0.050 M hydrofluoric acid with 50.0mL of 0.10 M sodium fluoride.
A 97 gram solution of silver nitrate contains 14 grams of AgNO3. What is the percent by mass of silver nitrate in this solution?
The Eu(III) standards added to the groundwater sample contained 0.181 ng/mL (ppb) of Eu(III). Calculate the concentration of Eu(III) in the groundwater sample.
Give the number of atoms in the unit cell. Assume the structure consists of identical atoms. face-centered cubic a. one b. two c. four d. eight
Write the condensed structural formulas and names for all the constitutional isomers with the formula C4H9Br
A sealed container holds 1.00 mole of helium and 2.00 moles of nitrogen at 30.0°C. When the total pressure of the mixture is 666 mm Hg, what is the partial pressure of the nitrogen? Provide an answer correct to 2 significant figures in mmHg.
A 10.20-mL sample of sulfuric acid from an automobile battery requires 35.99-mL of 2.33 M sodium hydroxide solution for complete neutralization. What is the molarity of the sulfuric acid? Sulfuric acid contains two acidic hydrogens.
at 710. mm hg a sample of nitrogen gas occupies 625 ml what volume does the gas occupy if the temperature constant and the pressure increases to 760. mm hg
When 7.00 moles of gas A and 3.00 moles of gas B are combined, the total pressure exerted by the gas mixture is 1.0 atm. What is the partial pressure exerted by gas A in this mixture?
So he concluded that entropy of ice must be greater than that the entropy of water liquid at 0 C. do you agree with his conclusion?
how many grams of water can be cooled from 33 to 20 by the evaporation of 37 of water? the heat of vaporization of
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