Verified Answer :

CaO + H20 --> Ca(OH)2 

Calcium Hydroxide has a relative molecular mass of approximately 74 grams. Therefore, with 370 grams provided, we have 370g/74g, or 5 moles. 

Therefore, due to molar ratios, 5 moles of CaO must have reacted with 5 moles of H2O to form 5 moles of Ca(OH)2. 

The answer to your question is 5 moles of CaO or 280 g of CaO

The required moles of CaO are needed to react with an excess of water to form 370 grams of calcium hydroxide is 280g.

What is the relation between mass & moles?

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

  • W = given mass
  • M = molar mass

Given chemical reaction is:

CaO + H₂O → Ca(OH)₂

Moles of Ca(OH)₂ = 370g / 74g/mol = 5mol

From the stoichiometry of the reaction, 5 moles of CaO is required to produce 5 moles of Ca(OH)₂.

Mass of CaO = (5mol)(56g/mol) = 280g.

Hence required mass of CaO is 280g.

To know more about mass & moles, visit the below link:
https://brainly.com/question/18983376

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