Answers

1. Answers (2) C (3) C (4) D (5) C (6) C (7) A (8) C (9) C (10) B (11) C

2. What is the molar mass of (NH4)2CO3? iRespond Question Multiple Choice F F A.) 144 g/mol B.) 138 g/mol C.) 96 g/mol D.) 78 g/mol E.)

3. What is the percent composition of chromium in BaCrO4? iRespond Question Multiple Choice F F A.) 4.87 % B.) 9.47 % C.) 20.5 % D.) 25.2 % E.)

4. What is the mass in grams of 5.90 moles of C8H18? iRespond Question Multiple Choice F F A.) 0.0512 g B.) 19.4 g C.) 389 g D.) 673 g E.)

5. What is the number of moles in 432 grams of Ba(NO3)2? iRespond Question Multiple Choice F F A.) 0.237 mol B.) 0.605 mol C.) 1.65 mol D.) 3.66 mol E.)

6. How many atoms are in 3.5 moles of arsenic atoms? iRespond Question Multiple Choice F F A.) 5.8 x 10-24 atoms B.) 7.5 x 101 atoms C.) 2.1 x 1024 atoms D.) 1.7 x 1023 atoms E.)

7. How many moles of silver atoms are in 1.8 x 1020 atoms of silver? iRespond Question Multiple Choice F A.) 3.0 x 10-4 B.) 3.3 x 10-3 C.) 3.0 x 102 D.) 1.1 x 1044 E.)

8. What is the number of moles in 500 Liters of Helium gas at STP? iRespond Question Multiple Choice F F A.) 0.05 mol B.) 0.2 mol C.) 22 mol D.) 90 mol E.)

9. Which of the following is NOT an empirical formula? iRespond Question Multiple Choice F F A.) Sb2S3 B.) C2H8O C.) C2N2H8 D.) BeCr2O7 E.)

10. Which of the following have the same empirical formula? iRespond Question Multiple Choice F F A.) CO2 and SO2 B.) C7H14 and C10H20 C.) C4H10 and C10H4 D.) C6H12 and C6H14 E.)

11. What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight? iRespond Question Multiple Choice F F A.) SO B.) SO2 C.) SO3 D.) S6O4 E.)