9/11 Concept Test Questions

1. What is the total number of atoms in 1 mole of aluminum iodide?
A) 2
B) 4
C) 2 x 6.022 x 1023
D) 3 x 6.022 x 1023
E) 4 x 6.022 x 1023

2. How many hydrogen atoms are there in 34 g of ammonia, NH3? Molar mass of NH3 = 17.0 g/mol
A) 2
B) 6
C) 2 x 6.022 x 1023
D) 3 x 6.022 x 1023
E) 6 x 6.022 x 1023

3. Examine the condensed structural formulas shown below:

I. Acetic acid (main ingredient in vinegar), CH3COOH
II. Formaldehyde (used to preserve biological specimens), HCHO
III. Ethanol (alcohol in beer and wine), CH3CH2OH

For which of these molecules is/are the empirical formula(s) and the molecular formula(s) identical?
A) II
B) I and II
C) II and III
D) I, II and III