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(Cr, at.wt. = 52.0), and 9.52 grams of oxygen (O, at.wt. = 16.0). The empirical formula of this compound is a. K₂Cr₂O7 d. K₂Cr₂O₂ b. K₂CRO4 c. K3CrO3 e. KCrO4 T

(Cr, at.wt. = 52.0), and 9.52 grams of oxygen (O, at.wt. = 16.0). The empirical formula of this compound is a. K₂Cr₂O7 d. K₂Cr₂O₂ b. K₂CRO4 c. K3CrO3 e. KCrO4 T

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5. A 25.0 gram sample of a compound contains 6.64 grams of potassium (K, at.wt. = 39.1), 8.84 grams of chromium (Cr, at.wt. = 52.0), and 9.52 grams of oxygen (O, at.wt. = 16.0). The empirical formula of this compound is a. K₂Cr₂O7 b. K₂CRO4 c. K3CrO3 d. K₂Cr₂O₂ e. KCrO4 6. On what electrode and What mass (in gram) of chlorine gas could be released from a solution of nickel(II) chloride by a current of 0.25 amperes flowing for 10 hours? (At. Wt Cl=35.5g/mol). a. 3.311gm on cathode c. 3.311gm on anode b. 6.603gm on anode d. 6.603gm on cathode 7-Identify the correct statement(s) in relation to the following reaction Zn + 2HCl → ZnCl₂ + H₂ a.zinc is acting as an oxidant b. chlorine is acting as a reductant d. zinc is acting as a reductant c.hydrogen ion is acting as an oxidant 8. A sample of mono atomic ideal gas at 2 atm and 25cº expand adiabatically and reversibly from 4.5 to 12.5 L. Final temperature, final pressure, work, and internal energy of this process respectively are: a. (150k ,0.5at, 246.5J, 250.5J) b.(124k, 3atm, 0, 0) c (150k, 0.36atm, 679J, 679J) d.(140k, 4atm, 633.5J, 0) 9. If you have 25 g of Br2 and dissolved in 1L cyclohexane, density is 0.9Kg/L (At. wt. Br= 79.9). The molality of solution is: a. 0.4 b. 0.17 d. 0.3 c. 0.02 10. The oxidation state for underlined ion (AsO4³, K2O2, H31062, LiAlH4) a. (+5, -2, +7, +1) b. (+5, -1, -1, +1) c. (+3, -2, +7, -1) d. (+5, -1, +7, -1) e. (+3, -1, +7,+1)
Transcribed Image Text:5. A 25.0 gram sample of a compound contains 6.64 grams of potassium (K, at.wt. = 39.1), 8.84 grams of chromium (Cr, at.wt. = 52.0), and 9.52 grams of oxygen (O, at.wt. = 16.0). The empirical formula of this compound is a. K₂Cr₂O7 b. K₂CRO4 c. K3CrO3 d. K₂Cr₂O₂ e. KCrO4 6. On what electrode and What mass (in gram) of chlorine gas could be released from a solution of nickel(II) chloride by a current of 0.25 amperes flowing for 10 hours? (At. Wt Cl=35.5g/mol). a. 3.311gm on cathode c. 3.311gm on anode b. 6.603gm on anode d. 6.603gm on cathode 7-Identify the correct statement(s) in relation to the following reaction Zn + 2HCl → ZnCl₂ + H₂ a.zinc is acting as an oxidant b. chlorine is acting as a reductant d. zinc is acting as a reductant c.hydrogen ion is acting as an oxidant 8. A sample of mono atomic ideal gas at 2 atm and 25cº expand adiabatically and reversibly from 4.5 to 12.5 L. Final temperature, final pressure, work, and internal energy of this process respectively are: a. (150k ,0.5at, 246.5J, 250.5J) b.(124k, 3atm, 0, 0) c (150k, 0.36atm, 679J, 679J) d.(140k, 4atm, 633.5J, 0) 9. If you have 25 g of Br2 and dissolved in 1L cyclohexane, density is 0.9Kg/L (At. wt. Br= 79.9). The molality of solution is: a. 0.4 b. 0.17 d. 0.3 c. 0.02 10. The oxidation state for underlined ion (AsO4³, K2O2, H31062, LiAlH4) a. (+5, -2, +7, +1) b. (+5, -1, -1, +1) c. (+3, -2, +7, -1) d. (+5, -1, +7, -1) e. (+3, -1, +7,+1)
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