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What volume of 0.100 M sodium hydroxide is required to completely neutralize 50.0 mL of 0.100 M phosphoric acid? A 25.0-mL solution of 3.00 M acetic acid (HC2H3O2) required 65.6 mL of NaOH to reach the endpoint. Calculate the original concentration of the NaOH(aq).
Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops
A copper wire (density = 8.96 g/cm3) has a diameter of 0.18 mm. If a sample of this copper wire has a mass of 33 g, how long is the wire?
85.0 of is initially at room temperature (22). A chilled steel rod at 2 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar?
the activation energy for the isomerization of methyl isonitrile is 160 kJ/mol. Calculate the fraction of methyl isonitrile molecules that has an energy of 160.0 kJ or greater at 500 K.
calculate the volume of air at 30 degrees celcius and 1 atm that is needed to burn completely 10 grams of propane. assume that air is 21 percent oxygen by volume
A sample of pure silver jewelry has mass of 63.3g and is heated to a temperature of 111.4C. It is placed into a container of water at 17C.
let's pretend a certain sterling silver ring has a mass of 31.25g. silver has 93%. determine the mass of silver found in the ring.
Define internal energy and enthalpy. What is the difference between the two? List the following gases in order of increasing root-mean-square speed, all at the same temperature: H2, He, O2, Ne
Develop an argument based on bond enthalpies for the importance of SiO bonds in substances common in the Earth's crust in preference to SiSi or SiH bonds
A 35.0 mL sample of 0.225 M HBr was titrated with 42.3 mL of KOH. What is the concentration of KOH?
Order of reactivity, Suggest an explanation for the fact that the order of reactivity of the halides toward n-butylbrosylate in acetone
It takes 47.0 to raise the temperature of an 11.7 piece of unknown metal from 13.0 to 24.4. What is the specific heat for the metal?
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