Answer A) : We have to calculate the number of moles of Benzene involved in the reaction,
30 g / 78 moles of benzene = 0.384 moles
For bromine it will be the same process,
65 g / 159.8 moles = 0.406 moles
By observing the reaction given above we can say that the reaction ratio of bromine and benzene is 1 : 1
We need to find the mass of bromobenzene,
which should be, 6(12) + 5 (1)+ 79.90 = 156.9 g/mol
So, the mass of bromobenzene will be 156.9 g/mol X 0.3846 mol = 60.343 g
Hence the theoretical yield will be 60.34 g
Answer B) : To calculate the actual yield we have to divide it with theoretical yield.
(56.7g / 60.343 g ) X100% = 93.96 %
Here, we can say that we got 93.96 % of actual yield.
As we know it is impossible to get 100% yield in any reaction.
Answer:
013 g/mol is the molar mass of N2O.
Answer:
- <u>Tellurium (Te) and iodine (I) are two elements </u><em><u>next to each other that have decreasing atomic masses.</u></em>
Explanation:
The <em>atomic mass</em> of tellurium (Te) is 127.60 g/mol and the atomic mass of iodine (I) is 126.904 g/mol; so, in spite of iodine being to the right of tellurium in the periodic table (because the atomic number of iodine is bigger than the atomic number of tellurium), the atomic mass of iodine is less than the atomic mass of tellurium.
The elements are arranged in increasing order of atomic number in the periodic table.
The atomic number is equal to the number of protons and the mass number is the sum of the protons and neutrons.
The mass number, except for the mass defect, represents the atomic mass of a particular isotope. But the atomic mass of an element is the weighted average of the atomic masses of the different natural isotopes of the element.
Normally, as the atomic number increases, you find that the atomic mass increases, so most of the elements in the periodic table, which as said are arranged in icreasing atomic number order, match with increasing atomic masses. But the relative isotope abundaces of the elements can change that.
It is the case that the most common isotopes of tellurium have atomic masses 128 amu and 130 amu, whilst most common isotopes of iodine have an atomic mass 127 amu. As result, tellurium has an average atomic mass of 127.60 g/mol whilst iodine has an average atomic mass of 126.904 g/mol.
Scratching causes cracks and crevices on the surface of the flask (though microscopically). These will act as favorable sites for nucleation, which leads to the formation of crystals.
