The reaction of calcium with water is represented by the equation
`Ca+2H_(2)OtoCa(OH)_(2)+H_(2)`
What volume of `H_(2)`, at STP would be liberated when 8g of calcium completely reacts with water

Options

A. `4480 cm^(3)`
B. `2240 cm^(3)`
C. `1120 cm^(3)`
D. `0.4 cm^(3)`

Answer

A

Explanation

`{:(,Ca,+,2H_(2)O,rarr,Ca(OH)_(2),+,H_(2)O),("Initially","0.2 moles",,-,,-,,-),("Finally",-,,,,,,"0.2 moles"):}`
`rArr` Volume of `H_(2) = 0.2 xx 22400 = 4480 cm^(3)`