# 1. 23 (Points: 4) Choose which set is the correc…

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1. 23 (Points: 4) Choose which set is the correct coefficients for the following equations:B5H9 + O2 ————– B2 O3 + H2O a. 2, 12, 5, 9 b. 12, 2, 5, 9 c. 1, 9, 5, 12 Save Answer 3. 20 (Points: 4) Choose which set is the correct coefficients for the following equations:Mg + O2 ———– MgO a. 1, 1, 2 b. 2, 1, 2 c. 1, 1, 1 Save Answer 5. 19 (Points: 4) Choose which set is the correct coefficients for the following equations:Ag2O —— Ag + O2 a. 1, 1, 2 b. 2, 2, 1, c. 2, 4, 1 Save Answer 6. 22 (Points: 4) Choose which set is the correct coefficients for the following equations:CH4 + O2 ——— CO2 + H2O a. 1, 1, 1, 1 b. 2, 2, 2, 2 c. 1, 2, 1, 2 Save Answer 11. 26 (Points: 4) When 200.0 g of Na2O2 were reacted, 32.0 g of O2 were collected. The yield of O2 collected was ? (Na=23, O=16) 2 Na2O2 + 2 H2O ———– 4 NaOH + O2 a. 100% b. 78.0% c. 50.0% d. no correct answer given Save Answer 13. 34 (Points: 4) How many grams of O2 are required to produce 100.0 g of SO2 ? (S=32.06, O=16) 4 FeS2 + 11 O2 —— 2 Fe2O3 + 8 SO2 a. 36.3 g b. 49.9 g c. 68.7 g d. no correct answer given Save Answer 17. 21 (Points: 4) Choose which set is the correct coefficients for the following equations:SbCl3 + Na2S —— Sb2S3 + NaCl a. 2, 1, 1, 6 b. 2, 3, 1, 6, c. 3, 2, 6, 1 Save Answer 18. 18 (Points: 4) Choose which set is the correct coefficients for the following equations:Cl2 + NaI —— NaCl + I2 a. 1, 2, 1, 1 b. 2, 1, 1, 2 c. 1, 2, 2, 1 Save Answer 19. 32 (Points: 4) How many moles of SO2 can be produced from 20.0 g of H2S ? ( H=1.008 amu, S= 32.06 amu) 2 H2S + 3 O2 —— 2 SO2 + 2 H2O a. 0.312 mol b. 2.0 mol c. 20.0 mol d. 0.587 mol Save Answer