Grignard reagent consists of any of numerous organic derivatives of magnesium (Mg), commonly represented by the general formula RMgX (in which R is a hydrocarbon radical: CH3, C2H5, C6H5, etc.; and X is a halogen atom, usually chlorine, bromine, or iodine).
What are Grignard Reagents?
In synthetic processes, Grignard reagents are used to create new carbon-carbon bonds. A extremely polar carbon-magnesium bond, in which the carbon atom has a partial negative charge and the metal a partial positive charge, characterizes a Grignard reagent.
The balanced equation for the formation of the Grignard reagent from bromobenzene is in the image.
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Answer:
Atoms He (Avogadro’s number) → Moles of He (molar mass of He) → Mass of He
• molar mass of He (from the periodic table) = 4.003 g/mol
• Avogadro’s Number: Avogadro’s number gives us the number of entities present in 1 mole: 6.022 × 1023 He atoms in 1 mole of He
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Answer : The number of moles of oxygen needed are, 1.5 moles.
Explanation :
The balanced chemical reaction will be:
Now we have to calculate the moles of oxygen.
From the balanced chemical reaction we conclude that,
As, 6 moles of water vapor produces from 5 moles of oxygen
So, 1.80 moles of water vapor produces from moles of oxygen
Therefore, the number of moles of oxygen needed are, 1.5 moles.