4-7 Determine empirical and molecular formulas

4-7-1. What is the sum of the subscripts in the empirical formula of C₆H₁₂?
A. 1, B. 2, C. 3, D. 18

4-7-2. A compound with an empirical formula of NO₂ has a molar mass between 43 and 47 g/mol. What is the molecular formula of the compound?
A. NO₂, B. N₂O, C. N₂O₃, D. N₂O₄

4-7-3. A sample of a compound contains 3.581x10²² C atoms and 1.436x10²³ H atoms. What is the empirical formula of the compound?
A. CH, B. CH₄, C. C₂H₅, D. C₃H₄

4-7-4. A sample of a compound contains 0.5860 moles of P and 1.466 moles of O. What is the empirical formula of the compound?
A. PO, B. PO₄, C. P₂O₅, D. P₃O₄

4-7-5. A sample of a compound contains 19.27 g Fe and 7.360 g O. What is the empirical formula of the compound?
A. FeO, B. FeO₂, C. Fe₂O₃, D. Fe₃O₄

4-7-6. Which of the following is an empirical formula of a compound that is 14.37% hydrogen by mass?
A. CH2
B. CH3
C. C2H4
D. C3H6

4-7-JJW-1. What is the formula for the compound composed of 71.62% gold, 13.10% carbon, and 15.28% nitrogen?
A. AuCN B. Au(CN)₂ C. Au(CN)₃ D. Au(CN)₄