How many moles of CaC2 are needed to react completely with 45.0g H2O?

Equation: CaC2+2 H2O--> C2H2 + Ca (OH) 2.

In order to react with 45 g of water 1.25 moles of CaC₂ are required.

Explanation:

Given dа ta:

Moles of CaC₂ needed = ?

Mass of water = 45.0 g

Solution:

Chemical equation:

CaC₂ + 2H₂O → C₂H₂ + Ca (OH) ₂

Number of moles of water:

Number of moles = mass / molar mass

Number of moles = 45 g / 18 g/mol

Number of moles = 2.5 mol

Now we will compare the moles of water and CaC₂ from balance chemical equation:

H₂O : CaC₂

2 : 1

2.5 : 1/2*2.5 = 1.25 mol

In order to react with 45 g of water 1.25 moles of CaC₂ are required.