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How many grams of methane CH4g must be combusted to heat 1.02 kg ofwater from 25.0C to 75.0C assuming H2Ol as a product and 100 efficiency in heat transfer?
A calorimeter, fabricated from 135.0 g of iron metal, thermallyinsulated from its surroundings, contains 173.0 g of water. Both the calorimeter and the water are at an initial temperature of21.25&de
Many common weak bases are derivatives of , where one or more of the hydrogen atoms have been replaced by another substituent. Such reactions can be generically symbolized as where is the base and i
Given pKa of dichloroacetic acid and trichloroacetic acid are 1.3 and .6. How many moles of trichloroacetic acid will be formed starting with 1.0 mole of dichloroacetic acid and 0.50 mole of the co
If this energy were used to vaporize water at100 degrees Celcius, how much water in liters could be vaporized?(Assume that the density of water is 1.0 g/mL.) The heat of vaporization of water at 10
When we heat saturated calcium hydroxide, why must c are be taken so that the saturated calcium hydroxide solution does not boil orspit?
On being heated in air, a mixture of FeO andFe2O4 picks up oxygen so as to convert completely to Fe2O3. If the observedweight gain is 5.00% of the initial weight, what must have been the composition
Copper in salt water near the dischargeof a sewage treatment plant is determined by first seperating andconcentrating it by solvent extraction of its dithizone chelate atpH 3 into a methylene chlori
Consider a sample of a hydrocarbon (a compound consisting of onlycarbon and hydrogen) at 0.959 atm and 298K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbondioxi
What is the total electron energy for Be, Be, and Be in thepresence of the Zeeman Effect. (Hint: You may use a symbol rather than numbers to express the energy of each interaction.)
A postulated mechanism for the reaction2N2O5 (g) →4NO2 (g) + O2 (g) consists of the following three steps.Assuming this is the correct mechanism what would the rate lawfor this reaction be?
Consider the following facts:water freezes spontaneously at -5C and 1 atm, and ice has a moreordered structure than liquid water Explain how a spontaneous process can lead to a decrease in the entr
What is the vapor pressure of the solution? (The vaporpressure of pure water at 25 degrees Celsius is 23.76 mmHg.) Consider the reaction that occurs on mixing 50.0 mL of 0.560 MNaHCO3 and 50.0 mL of
It is stated that "little or no dinitration is observed" in the nitration of methyl benzoate. However, if the reaction was heated for some time, dinitration products would be produced slowly.
Suppose that ammonia, applied to a field as a fertilizer, is washedinto a farm pond containing 3.0 × 106 L of water. If the pH of this pond is found to be9.81, what volume of liquid ammonia fo
When a0.2252-g sample of an unknown organic substance is similarly burnedin the same calorimeter, the temperature rises by 3.46 °C. What is the energy of combustion per unit mass of the unknown
Calculate the heat required to convert 14.7 g of ethyl alcohol,C2H6O, from a solid at -144°C into thegaseous state at 95°C. The normal melting and boiling points ofthis substance are -117&de
Explain why, in contrast to meso-stilbene dibromide, the dibromidedl-Stilbene dibromine (colorless) exists in two enantiomericforms.
A solid zinc cadmium, ZnCd(SCN)4, has a tetrahedral Zn and Cd atoms connected in a three-dimensional network by Cd-S=C=N-Zn bridges which are linear at C and , but bent at S. Give a rationale for
In the Fischer esterification of benzoicacid, the methyl alcohol is present in excess over the amount needed. Calculate the amount of methyl alcohol that is required by the balanced reaction.
What is the composition of the bubbles observed when the crude methyl benzoate product is washed with sodium bicarbonate? Hint: Consider the acidity of the solution (some HCl will still be present)
A metal wire 1 mm in diamter x 10 m long carries a current of.1 A. If the metal is pure copper at 30 degrees C, what is the volatage drop along this wire.
The smell of ripe raspberries is due to4-(p-hydroxyphenyl)-2-butanone, which has the empirical formulaC5H6O. To find its molecular formula, you dissolve 0.135g in 25.0gof cholorform, CHCl3.
A 16 ounce speciality coffee drink contains 254 mg caffeine. If all the caffeine is extracted and dissolved in an equal amount of water, what is the pH of the solution? What is the percent ionizatio
The ionization constant for benzoic acid is 6.5 X 10^-5. Find the hydrogen ion concentration at equilibrium when the initial concentration of the benzoic acid is 0.00024 M.