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How many moles of oxygen are needed to react completely with 2.20×10^24 molecules of acetylene?
Show the mechanism that forms the three products. Predict the major and minor products. Explain your choices.
Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (a) 100.0 mL of 0.30 M HC7H5O2 (Ka= 6.4 multiplied by 10-5) titrated by 0.30 M NaOH.
The system CO2(g) + H2(g) - > H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. H
Which reagent or test could you use to distinguish between ethynylbenzene and vinylbenzene
The half-lives are 50.0 min for A and 18.0 min for B. If the concentrations of A and B are equal initially, how long will it take for the concentration of A to be four times that of B?
Calculate the standard reaction enthalpy for the oxidation of nitric oxide to nitrogen dioxide
The density of helium gas at 0 oC and 1.00 atm is 0.17685 g/L. What is the volume of a balloon containing 10.0 g of helium under the same conditions?
What is the difference between Valence bond theory and VSEPR theory? is it just that one shows bond angles and the other doesnt?
What is the mass of a mixture of 1.33x10^24 formula units of Na2SO4, 1.500 moles of H2O and 3.77g of AgCl?
Large quantity of ammonia are burned in the presence of platinum catalyst to give nitric oxide as d first step in the preparation of nitric acid. Suppose a vessel contains 0.120 mol of ammonia and
A volume of 125 of is initially at room temperature (22.0). A chilled steel rod at 2.00 is placed in the water. If the final temperature of the system is 21.0 , what is the mass of the steel bar?
A 4.80 g nugget of pure gold absorbed 288 J of heat. What was the final temperature of the gold if the initial temperature was 26.0°C? The specific heat of gold is 0.129 J/(g·°C).
exactly 50ml solution of Na2CO3 was titrated with 65.8ml of 3.00M HCl. if the specific gravity of the agnO3 solution is 1.25, what percent by weight of Na2Co3 does it contain?
Which of the following aqueous solutions are good buffer systems ?
In a calorimetry experiment, it was determined that the heat change of the surroundings, qsurroudings, was 4482 J. What is the heat change of the system, qsystem?
If the sulfur content of the coal is 1.30% by weight, how many tons of SO2 are dumped into the atmosphere each day?
Calculate delta E for the combustion of a gas that releases 195.0 kJ of energy to its surroundings and does 54.5 kJ of work on its surroundings.
A 10.0 gram piece of metal is placed in an insulated calorimeter containing 250.0 g of water initially at 20.0°C. If the final temperature of the mixture is 25.0°C, what is the heat change o
Under the conditions of this problem, which correction dominates, the one for finite volume of gas molecules or the one for attractive interactions? Explain.
lthough the exact role of C-5 methylation in gene expression is not known, it is known that these C-5-methylated cytosines are a source of mutations. Explain why this is a cause of mutations.
A 10.0 gram piece of metal is placed in an insulated calorimeter containing 250.0 grams of water initially at 20.0°C. If the final temperature of the mixture is 25.0°C, what is the heat chan
In a calorimetry experiment, it was determined that a 92.0 gram piece of copper metal released 1860 J of heat to the surrounding water in the calorimeter (qcopper = -1860 J). If the final temperatur
Draw a typical conformation of an average atactic polystyrene molecule for average molecule weights of: (a) 50,000 g/mole; and (b) 1500 g/mole.