Q. The reaction of calcium with water is represented by the equation, $Ca + 2H_{2}O \longrightarrow Ca(OH)_{2} + H_{2}$ What volume of $H_{2},$ at STP would be liberated when 8 g of calcium completely reacts with water?
A) 4480 $cm^{3}$
B) 2240$\ cm^{3}$
C) 1120$\ cm^{3}$
D) 0.4$\ cm^{3}$
Explanation
(a)
$Ca + 2H_{2}O \longrightarrow Ca(OH)_{2} + H_{2}$
22400$cm^{3}$
8 g of calcium will produce $= \frac{22400 \times 8}{40}$
$= 4480\ cm^{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.