Q. 1.0 g of magnesium is burnt with 0.56 g $O_2$ in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24; O = 16)
A) Mg, 0.16 g
B) $O_2$, 0.16 g
C) Mg, 0.44 g
D) $O_2$, 0.28 g
Explanation
[Solution] 0.56 g $O_2$ (0.0175 mol) reacts with 0.035 mol Mg = 0.84 g; Mg left = 0.16 g. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.