question archive 1) What is the oxidation number of the chromium atom in K2Cr04? A
1) What is the oxidation number of the chromium atom in K2Cr04? A
Subject:ChemistryPrice: Bought3
1) What is the oxidation number of the chromium atom in K2Cr04? A. -2 B. O C. +2 D. +6 E. +7 2. How many moles of nitrogen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol. 4 KNO3(S) - 2 K20(s) + 2 N2(8) + 5 02(8) A. 0.290 mol N2 B. 0.580 mol N2 c. 18.5 mol N2 D. 0.724 mol N2 E. 1.73 mol N2 3. Which of the following is an oxidation- reduction reaction? A. HBr(aq) + NaOH(aq) - NaBr(aq) + H20(1) B. Nal(aq) + AgNO3(aq) - AgI(s) + NaNO3(aq) C. Pb(C2H302)2(aq) + 2 LiBr(aq) - PbBr2(s) + 2 LiC2H302(aq) D. Ba(s) + 2 HCI(aq) - BaC12(aq) + H2(8) E. All of the above are oxidation- reduction reactions. 4. Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of HO. What is the empirical formula of the compound? A. CH2 B. C2H5 C. C4H10 D. C5H2 E. CH3 5 . Determine the molarity of a solution formed by dissolving 97.7 g LiBrin enough water to yield 750.0 mL of solution A. 1.50 M B. 1.18 M MOLO: MOLO MOLO MORO C. 0.130 M D. 0.768 M E. 2.30 M
