unit 2, quantities in chemical reaction test

12. A sample of benzene, C6H6, contains 3.0 x 1023 molecules of benzene. How many atoms are in the sample? a. 36 x 1024 b. 1.8 x 1023 c. 3.6 x 1024 d. 2.5 x 1022 e. 3.0 x 1023 13. What is the molar mass of ammonium sulphate? a. 114.12g/mol b. 68.17g/mol c. 50.12g/mol d. 132.17g/mol e. 103.14g 14. The mole is used because? a. scientists like to make things more complicated for the masses b. the atom is too small of a unit to see c. the periodic table is unreliable for such information d. atoms do not weigh enough to count 15. Examine the following formulas. Which formula is an empirical formula? a. C2H4 b. C6H6 c. NazCr207 d. C2H2 e. H202