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"Tungsten with a mass numer of 185 and atomic number of 74, decays by beta emissions. Identify the product of the nuclear reaction by its atomic symboll, mass number and atomic number?".
A certain metal has a density of 10.2 g/cm3 at 25C. it crystallizes in a body-centered cubic arrangement with a unit cell edge length of 314.7 pm. determine the atomic weight.
Calculate the volume of 0.50M NaOH needed to exceed saturation by 10% the volume from question 4 of 0.50M Mn(NO3)2 with Mn(OH)2.
In a reaction 82.00 g of sodium reacts with 74.00g of ferric oxide to form sodium oxide and iron metal. calculate the mass of solid iron produced
a steel tank containing helium is heated to 555?c. if you could look into the tank and see the gas molecules what would
Calculate the pH during the titration of 20.0 mL of 0.25 M HBr with 0.25 M KOH after 19.90 mL of the base have been added.
What is the pressure of a mixture of helium, nitrogen and oxygen if their partial pressures are 600 mmHg, 150mmHg and 102mmHg
For the subsequent reactions, look up the delta Hf values to compute delta H rxn and S values to evaluate delta S system and hence compute delta S universe at 298 K.
Describe the difference between the following and list any particular advantage possessed by one over the other a)hydrogen and deuterium discharge lamps as sources for ultraviolet radiation
A certain human gene was shown to have only 80% of its DNA sequence identical to that of an ape, but its corresponding protein sequence has 95% identity
Compare this energy ( 23 Joules) to the amount of energy absorbed by a person's body if they jumped from a chair to the floor (assume that all of the energy from the fall is absorbed by the person and h=0.5 m).
A cylinder is labeled \"PENTANE.\" When the gas inside the cylinder is monochlorinated, five isomers of formula C5H11Cl result. Was the gas pure n-pentane, pure isopentane, pure neopentane, or a mixture of two or all three of these
The half-life for the first-order reacion of HCl with ethylene is 15.4 s when the initial concentration of HCl is 0.67 M. What is the rate constant for this reaction?
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