Answer:
The number of atoms in 20 grams of Pa-234 is 5.14 ×10²² atoms
Explanation:
Given that the molar mass of Pa-234 (protactinium) is 234.04331, we have
The number of moles of protactinium in 20 grams of Pa-234, we have
Number of moles = Mass/(Molar mass) = 20/234.04331 = 0.0855 moles
One mole of Pa-234 contains 6.02×10²³ atoms, therefore, we have;
0.0855 moles of Pa-234 contains 0.0855× 6.02×10²³ = 5.14 ×10²² atoms
Therefore, the number of atoms in 20 grams of Pa-234 = 5.14 ×10²² atoms.
Answer: the name of the reaction is Combustion
Explanation: Combustion is a reaction in which a substance burns in air (oxygen) to produce CO2 and H20
There are a total of 6 hydrgen atoms
The reaction rate of a chemical reaction is determined by the slow step in the reaction mechanism.
The rate ii given by the product of the species of the determining step, each raised to its coeeficient in the chemical reaction that represents this step.
So, given that the determining step is represented by A + 2B→C, the reaction rate is r = k[A]*[B]^2.
This mechanism is verified becasue the total order is the summ of the coefficientes : 1 + 2 = 3 and the exponent 2 makes B is a bigger rate determinant than A.
So, the answer is the option b. k[A][B]^2.
Molar mass of C2H5OH<span> is </span>46.0684 g/mol
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