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A vessel with a tiny hole in its wall is filled with oxygen (O2) to a pressure of 1 atm at 25oC. In a one-minute period, 3.25g of oxygen effuse out through the hole into a vacuum. The vessel is evacuated and filled with an unknown gas at the same pressure and temperature. In this case, only 1.96g of the unknown gas effuse out in one minute. Calculate the molar mass of the unknown gas.
If the titration required 23.95 mL of 0.2556 M HCl to reach the endpoint, calculate the equilibrium molar concentration of B4O5(OH)4 2- in the saturated solution.
The concentration of a biomolecule inside a rod shaped prokayorate call is 0.0025M Calculate the number molecules inside the cell, which is 2.4 um long and 1.4 um in diameter.
The average speed of a nitrogen molecule at 25 degrees celsius is 515 m/s. What is the average speed of an ammonia molecule at that temperature
a tank of volume 1.0 m3 contains 7.3 moles of nitrogen 5.2 moles of oxygen 1.5 moles of helium and 8.1 moles of carbon
You have weighed out 520 mg of methyl oleate. Knowing that the sample you received only contains 70 % of methyl oleate, how many mmole of methyl oleate did you weigh out
one hundred grams of water is saturated with nh4clat 50 degrees c. according to table g if the temperature is lowered
Assign oxidation numbers to all the elements in the following reaction and identify the oxidizing and reducing agents. HNO3+ I2--->HIO3+NO2+H2O
Write an equation for the reaction of magnesium oxide with sodium chloride to produce magnesium chloride and sodium oxide. 1)show formulas of the reactants 2)show formulas of the products
how would you distinguish between methyl benzoate and phenylacetic acid using 1h nmr
explain why there are significant color changes that occur insubstitution reactions. talk about the origins of color
Pure olive oil has an iodine value of about 85. A very old sample or originally pure olive oil is found to have an iodine value of 55. Explain
a solution is made by mixing 49.0 ml of ethanol c2h6o and 51.0 ml of water. assuming ideal behavior what is the vapor
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