how many moles of calcuim oxide are needed to react with an excess of water to form 370g of calcuim hydroxide

Answer:-

5

Explanation:-

Chemical formula for calcium oxide = CaO

Chemical formula of water = H2O

Chemical Formula of Calcium Hydroxide = Ca (OH) 2

Mass of Ca (OH) 2 = 370g

Molar mass of Ca (OH) 2 = 40 x 1 + (16 x 1 + 1 x 1) x 2

= 74 g mol-1

Number of moles of Ca (OH) 2 = 370 g / 74 g mol-1

= 5 moles

The balanced chemical equation for this process is

CaO + H2O - -> Ca (OH) 2

From the equation we see

For 1 mol of Ca (OH) 2 to form, 1 mol of CaO is needed to react.

For 5 mol of Ca (OH) 2 to form, 5 x 1 / 1 = 5 mol of CaO is needed to react.