Answer:
Biphenyl
Explanation:
The reaction of bromo benzene with magnesium-ether solution yields a Grignard reagent.
The byproduct of this reaction is biphenyl. It is formed when two unreacted bromobenzene molecules are coupled together.
Hence, It is advised that the bromobenzene solution be added slowly to the magnesium-ether solution so that it isn't present in a high concentration, thus reducing the amount of biphenyl by-product formed.
Shown above are three simple diatomic molecules. On the left is H2, with a single bond between the H atoms. Since two H atoms have the same electronegativity, they share the electrons evenly. Fluorine is much more electronegative than hydrogen, so the majority of electron density resides on the fluorine atom.
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I believe the answer would be halogens
Chloral hydrate has the formula <span>C2H3Cl3O2
mass of carbon : 12
mass of Cl : 35.5
mass of hydrogen : 1
mass of oxygen : 16
So, molar mass of chloral hydrate = 2(12) + 3(1) + 3(35.5) + 2(16) = 165.5 gm
1 mole contains </span><span>6.02 x 10^23 molecules
Thus, mass of one molecule = 165,5 / (</span><span>6.02 x 10^23) = 2.75 x 10^-22 gm
therefore, mass of 500 molecules is equal to:
500 x 2.75 x 10^-22 = 1.37 x 10^-19 gm</span>