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A certain first-order reaction () has a rate constant of 7.20×10-3 at 45 . How many minutes does it take for the concentration of the reactant, , to drop to 6.25 of the original concentration?
what is the temperature change if 84 joules of heat are added to a pure gold coin with a mass of fifteen grams? it is
A piece of copper has a volume 640 L. How many atoms does the sample contain.
What is the enthalpy change for the combustion of 12.5g C4H10 in excess oxygen? C4H10 (g) + 13/2 O2 (g) ------? 4 CO2 (g) + 5 H2O (g) H0 = -1895 kJ
What would be the expected freezing point of a solution made up of 0.4237g of solute dissolved in 27.3g cyclohexane? The solute has a MW of 173.5 g/mol.
Which of the following correctly describes Tollens' reagent? a. a solution of silver nitrate in water b. a solution of silver nitrate and ammonia in water c. a solution of silver nitrate in hydrochloric acid d. none of the above correctly describe..
Ascorbic Acid (Vitamin C) is diprotic acid (Ka1= 8.00x10^-5 and Ka2= 1.60x10^-12). What is the pH of a 0.250M solution of ascorbic acid?
Suppose the reaction is at equilibrium 2NOBr (g) 2NO(g)+Br2(g) Delta Hf NOBr=82.2 Kj/mol DeltaHf NO=90.4 KJ/mol What happens to Kp when the temperature is increased
They hydrogen atom is not actually electronegative enough to form bonds to xenon. Were the xenon-hydrogen bond to exist, what would be the structure of XeH4
If you add a solvent called "dioxane" to water, a homogenous mixture forms. Dioxane and water have the same boiling point (100oC). How do you explain that the mixture of the two compounds shows a boiling point that is lower than the one found for ..
A 45.0-L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?
if h2 of 50.0 ml and c2h4 of 50.0 ml are permitted to react at the pressure of 1.5 atm produce c2h6 that has a volume
what are physical challenges of creating and moving one mole of a common household item from the eastern to the western
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