General exercises (2007 VCE)

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

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