University:
Arizona State University
Course:
CHM 101 | Introductory Chemistry
Academic year:

2021
Views:

62

Pages:

1
Author:

sonalhava9qv

Answers 1. Determine the empirical formula for: 92.24 % C; 7.76 % H a. ANS: CH 2. Determine the empirical formula for: 36.48 % Na; 25.44 % S; 38.08 % O a. ANS: Na2SO3 3. Determine the empirical formula for: 49.99 % C; 5.61 % H; 44.40 % O a. ANS: C3H4O2 4. Determine the empirical formula for: 38.76 % Ca; 19.97 % P; 41.27 % O a. ANS: Ca3P2O8; The compound is actually: Ca3(PO4)2 5. What is the empirical formula for a compound that contains 17.34% hydrogen and 82.66% carbon? a. ANS: C2H5 6. What is the molecular formula for a compound that is 46.16% carbon, 5.16% hydrogen and 48.68% fluorine if the molar mass of this compound is 156.12 g? a. ANS: C6H8F4 7. A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula. a. ANS: C2H8N2 8. A compound analyzes as 79.08 % C; 5.54 % H and 15.38 % N. What is the molecular formula if the molar mass is 273.36 g/ mol? a. ANS: C18H15N3 9. A 170.0 g sample of an unidentified compound contains 29.84 g of sodium, 67.49 g of chromium, and 72.67 g of oxygen. What is the compound’s empirical formula? a. ANS: Na2Cr2O7 10. A compound containing 5.9265 % H and 94.0735 % O has a molar mass of 34.01468 g/mol. Determine the empirical and molecular formula of this compound. a. ANS: HO; H2O2