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When a 8.37-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 445.8 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture? The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
Why is molarity not the best means of stating acid strength? Is molarity the most representative form of quantifying acids and bases?
A wavelength of 880 nm produces how much energy in joules per photon and kilojoules per mole of photons
A metal sample weighing 34.526 g was heated to 98.0 C then quickly transferred into Styrofoam cup calorimeter containing 74.365 g of distilled water at a temperature of 27 C. The temperature of the water in the cup increased and stabilized at 29 C..
A compound containing only carbon, hydrogen, and oxygen is subjected to elemental analysis. Upon complete combustion, a 0.9294-g sample of the compound
The water is analyzed and found to be 735 ppm in phosphate ion. What is the % phosphate ion in the dry detergent? What is the % phosphorus in the dry detergent? How many grams of phosphate are in the 300. g sample?
The pressure of the He at 25 degrees celsius is 145 mmHg. The bulb is then heated to 325 degrees celsius and all the (NH4)2 S decomposes to form NH3 and H2S, with a resulting total gas pressure of 875 mmHG. What is the partial pressure of the NH3 ..
Using the value of Ka from your titration curve, calculate that pH at the equivalence point?
10mL of 0.1M HNO2 (nitrous acid, ka=4.0x10^-4)is titrated with a .01M KOH solution. After 10mL of the KOH solution is added, what will be the pH in the titration flask?
Calculate the Ka for the acid. The initial concentration of the acid is 0.010m?
If it takes 8.5 for the concentration of to decrease from 0.90 to 0.45 , how many hours are required for the concentration to decrease from 0.40 to 0.10
Calculate k, Calculate also how long it would take for half of A to react. assume pseudo first order with k'=k[OH-], since [OH-] is in great excess.
A 10mL sample of aquarium water was treated with reagents to form a colour, and after dilution to 100 mL was found to have an absorbance of 0.162. calculate the concentration in ppm of nitrite in the aquarium water.
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