This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Problem 3.21a. 2. (2 pts) Determine the percentage by mass of oxygen in sodium sulfate. Problem 3.23d. CHEM 2045C: Quiz 4 Eng Q8059x04 Show your work for full credit THE END 3. (3 pts) For the following reaction, how many moles of hydrofluoric acid are needed to react with 0.310 mol of Na 2 SiO 3 ? Na 2 SiO 3 (s) + 8 HF (aq) H 2 SiF 6 (aq) + 2 NaF (aq) + 3 H 2 O (l) modified Problem 3.57a. 4. (6 pts) Give the empirical and molecular formula for a compound that contains 40.0% C, 6.7% H, and 53.3% O by mass. The molecular weight of the compound is 90.1 g/mol. modified Problem 3.43c....
View Full Document