In Chemistry / Junior High School | 2024-10-23

al Chemistry 1 2. Which of the following has the least percentage of H? a. oil of vitriol - sulfuric acid (H2SO4) b. muriatic - hydrochloric acid (HCI) C. aqua fortis - nitric acid (HNO₂) d. vinegar - acetic acid (HC₂H₂O2) 3. Which of the following bases will yield highest percentage of -OH dissolved in water? a. slaked lime - Ca(OH)2 c. caustic soda - NaOH b. milk of magnesia - Mg(OH)2 d. caustic potash - KOH 4. Which of the following could be an empirical formula? a. CH10 b. N₂H6 C. CH₁₂O d. N2O5 5. By mass, this compound is made up of 30.4% N and 69.6% O. What is correct chemical formula of this compound? a. NO b. NO₂ C. NO3 d. N₂O 6. The atomic mass of C is 12 amu while H is 1 amu. The molar mass of C is 16 g/mol. What is the percentage composition of CH? a. 50% C; 50% H c. 75% C; 25% H b. 12% C; 16% H d. 90% C; 10% H _ 7. Phosporic acid is a clear and odorless liquid found in carbonated beverage What is the percentage composition by mass of H? a. 3.061% b. 31.61% c. 65.31% d. 6.20% _8. What is the molecular formula of a compound having an empirical formula C₂HO and a molecular mass of 90 g/mol? a. C₂HO b. CH₁₂ C. CH2O d. CH₁O _ 9. Which of the following is the empirical formula of alkanes with a molar mas of 58 g/mol? a. C₂H5 b. CH10 C. CH2.5 d. C₂H 20 10. Which of the following sets of empirical formula, molar mass, and molecula formula is correct? a. C,H,O,, 180 g/mol, C%H,,Os b. CH2O, 342 g/mol, C12H22O11 c. NH3, 17 g/mol, NH, d. C₂H, 56 g/mol, CH Conceptual Science and Beyond 73​

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