Different quantities of nitrogen oxide (NO) are listed below.
Which one contains the least number of molecules?
A. 6 × 10² L at 273 K and 1 atm
B. 6 × 10²³ molecules
C. 6 × 10² g
D. 6 mol
Solution.

When 2.54 g of solid iodine reacts with excess chlorine and the unreacted chlorine is evaporated, 4.67 g of a
yellow product remains.
The empirical formula of the product is
A. ICl₂
B. ICl₃
C. ICl₄
D. ICl₅

Solution