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What mass of solid sodium fluoride (molar mass = 41.99 g/mol) should be added to 1.0 L of 0.23M hydrofluoric acid to make a buffer with a pH of 2.94? (Ka of HF = 1.36 x 10-3)
Sketch a cylinder with ten molecules of helium (He) gas. The cylinder has a movable piston. Label this sketch before. Make an after sketch to represent
Calculate the heat that must be supplied to 0.104g of Ne(g) at 0.250 atm to raise its temperature from 22.0 degree Celsius to 60.0 degree Celsius at
a chemical reaction produces 0.884mol of H2S gas. what volume will that gas occupy at STP?
Estimate the triple point pressure and teperature of water, given that the standard enthalpies of fusion and vaporization are 6008 J/mol and 43990 J/g at 273.15 K and 298.15 K, repectively
An asteroid is in the shape of sphere and has a mass of 1000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 1.2 meters
It then gives off a photon having a wavelength of 1740 nm. What is the final state of the hydrogen atom? Values for physical constants can be found here.
A pound of coffee beans yields 70 cups of coffee (4 cups = 1 qt). How many milliliters of coffee can be obtained from 1.0 g of coffee beans.
Molybdenum crystallizes in a body-centered cubic lattice (the Mo atoms are at the lattice points only). If the density of the metal is 10.3 g/cm3, what is the unit cell edge length in pm?
What organic product(s) is formed when 1-methylcyclopentanol is heated in the presence of an acid catalyst?
Which of the following substances are reasonably soluble in water?
Acetylene gas (C2H2) is produced as a result of the reaction CaC2(s)+2H2O(l)-> C2H2(g)+Ca(HO)2(aq) if 13g of CaC2 are consumed in this reaction, how much H2O is needed?
The pH in a lake the size of 4.0 km X 7.0 km and an average depth of 100 m is found to be 4.5. Calculate the mass of calcium carbonate that must be added to the lake water in order to raise its pH to 6.0.
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