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Calculate the energy needed to convert 50.0 g methane (CH4) from a solid at --100.°C to a liquid at 25°C.
How many grams of Na2EDTA·2 H2O (FM 372.23) should be mixed with 2.07 g of Ca(NO3)2·2 H2O (FM 200.12) in a 500 mL volumetric flask to give a buffer with pCa2+ = 9.00 at pH 9.00?
When a sample of oxalic acid (H2C2O4), which is a diprotic acid, is titrated with 0.250 M potassium hydroxide solution, 24.44 mL of the potassium hydroxide solution are required to neutralize the acid. How many grams of oxalic acid where present i..
A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg. Its volume is 568 mL. After water vapor is removed
A 10.0 gram piece of metal is placed in an insulated calorimeter containing 250.0 g of water initially at 20.0°C. If the final temperature of the mixture is 25.0°C, what is the heat change of water
consider the following equalibrium: C2H6(g) + C5H12(g) CH4(g) + C6H14(g); Kp = 9.57 at 500K. Suppose 14.2 g each of CH4,C2H6,C5H12 and C6H14 are placed in a 25.0-l reaction vessel at 500 K. What is the value of Qp
compound has been analyzed and found to contain the following masses of elements: Carbon 0.2990g, hydrogen 0.05489g, nitrogen 0.2318g, and oxyen 0.1328g. calculate the tmpirical formula of the compound.
What is the molarity of a solution obtained when a mass of 23.6 g of calcium chloride is diluted to a volume of 250 mL in a volumetric flask? The molarity is ___x10^___ M.
Estimate the age of a bottled wine that has a tritium, 3^H, content 65.% that of freshly bottled wine. Tritium decays by beta decay and has a half life of 12.3 yr.
A solution that has a K+ concentration of 5.00ppm is to be prepared from solid KCl. Assuming a solution density of1.000g/mL how many miligrams of KCl must be added to make 1.00L solution?
The density of a gaseous element at 310oC and 1.02 atm is 2.64 g/L. What is the molecular weight of the element
how many milliliters of hydrogen would be collected at a pressure of 754 torr and 22 C in a reaction between 0.315 grams of Al and an excess of HCl
Use the following data to plot the inflection points for the heating curve of 1 mole of solid octane at its melting point, -56.8 degrees C. The first point should be at -56.8 and the last point should be at 150 degrees celcius.
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