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We add 10 mL of 0.1 M NaOH to 100 mL of solution containing 0.1 M CH3CO2H and 0.1 M CH3CO2-. (Ka = 1.8 x 10-5) Using the Henderson-Hasselbalch equation, pH = pKa + log([A-] / [HA]), determine the p
What percent of [Ca3(PO4)2] (a major component of bone) is Ca and what mass of Ca is present in 1 kg [Ca3(PO4)2]? 3.46 How many grams of sulfur are needed to react completely with 246 g of mercury to
Suppose that 1.02 of rubbing alcohol evaporates from a 75.0 aluminum block. If the aluminum block is initially at 25C, what is the final temperature of the block after the evaporation of the alcohol
Mass Mol Atoms Moles Mol Mass Moles Atoms g mol Atoms Moles How many atoms are in 1 g of What is the mass of 1 the substance shown below? Mole of the substance shown below? 10 g of the substance below
The rate constant of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 295 K and 305 K. What must the activation energy be for the rate constant t
As pH decreases, [H+] increases and solubility increases. The effect of pH on solubility is dramatic. A saturated solution of Mg(OH)2 has a calculated pH of 10.52 and contains [Mg2+] = 1.710-4 M.
How much energy (in kilojoules) is required to convert 255 of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 ?
A sample of steam with a mass of 0.550grams and at a temperature of 100 degrees celcius condenses into an insulated container holding 4.30grams of water at 6.0 celcius.Assuming that no heat is lost
It takes 48.0 J to raise the temperature of an 10.7 g piece of unknown metal from 13.0 degree Celsius to 25.0 degree Celsius. What is the specific heat for the metal?
The fact that the number of each type of atom on each side is equal is related to the Law of Conservation of Mass. Balance this equation using the smallest possible integers, S + HNO3 H2SO4 + NO2 + H2
At constant temperature and pressure, what is the maximum volume, in liters, of Fe2O3(s) that can be made from 11.87 L of FeS(s) and 11.74 L of O2(g)?
1 mol of Ar initially at 298 K undergoes an adiabatic expansion against a pressure P external = 0 from a volume of 20.0 L to a volume of 65.0 L. Calculate the final temperature using the ideal gas
If all four gases had initial concentrations of 0.650 M, calculate the equilibrium concentrations of the gases.
State the Arrhenius, Bronsted-Lowry, and Lewis definitions of acids and bases. Given an acid-base reaction equation, pick out the acid, base, conjugate acid, and conjugate base. Know the definition of
In an experiment 1.65g of lead(ii) nitrate react with .327g of zinc. What is the mole relationship between the lead nitrate and the zinc.
Which is the product of the following series of reactions? Which ester is likely to undergo a Claisen condensation to give this product?
What is the number of bond pairs and shapes of C2H4, C2H6, and COS?
Particular coal contains 5.45% by weight of sulfur. How many grams of SO2 gas will be produced when 100.0g of the coal is combusted?
What is the structure of the polysaccharide? Draw a repeating structure of the polysaccharide, showing glycosidic linkages and branches.
how many grams of water are needed to react with 485g of calcium carbide?
What quantity of heat would be evolved if 75.00g of mercury (Hg=200.59), (O=16.00) was burned in oxygen?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 76.5 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this
What is the enthalpy change of C2H4(g) + Br2(g)-> CH2BrCH2Br(g)?
A gas sample in a piston assembly expands, doing 588 kJ of work on its surroundings at the same time that 372 kJ heat is added to the gas. What is the change in internal energy of the gas during th
An antacid tablet containing magnesium hydroxide as an active ingredient requires 22.6 mL of 0.597 M HCl for complete neutralization. What mass of Mg(OH)2 did the tablet contain?