What amount of Al_2O_3 is produced from the reaction of 3.0 mol Al with 2.0 mol

Question

What amount of Al_2O_3 is produced from the reaction of 3.0 mol Al with 2.0 mol Fe_2O_3? 2Al + Fe_2O_3 rightarrow Al_2O_3 + 2Fe 1.5 mol 2.0 mol 3.0 mol 6.0 mol What amount of the excess reagent remains when 0.500 mol Li reacts with 0.350 mol N_2? 6Li(s) + N_2(g) rightarrow 2Li_2N(s) 0.0833 mol N_2 0.267 mol N_2 0.150 mol Li 0.147 mol Li What is the maximum mass of NO_2 that is formed when 7.5g of N_2O_5 are consumed? 2 N_2O_5(g) rightarrow 4NO_2(g) + O_2(g) 1.6g 3.2g 6.4g 15g When 8.70 g Al reacted with excess O_2, 12.8 g of Al_2O_3 was obtained. What was the percent yield?4 Al_2O_3 rightarrow 2 Al_2O_3 78.0% 68.0% 38.9% 16.4% When 20.7 g of HCl and 28.4 g of CaCO_3, are mixed both reactants are completely consumed. What mass of CO_2 gas is produced if the mass of the other products formed is 36.6g? 8.20g 12.5g 15.9g 85.7g Which reaction will results in a precipitate? FeCl_2(aq) + NaS(aq) rightarrow H_2SO_4(aq) + NaOH rightarrow KCl(aq)+ CaBr_2(aq) rightarrow NH_4NO_3(aq) + HI(aq) rightarrow Which is an example of an oxidation reduction reaction? CaCO_3(s) rightarrow CaO(s) + CO_2(g) 2H_2O_2(aq) rightarrow O_2(g) + 2H_2O(I) NaHCO_3(s) + HCl(aq) rightarrow NaCl(aq) + CO_2(g) + H_2O(I) 2Pb^2+(aq) + Cr_2O^2+_7(aq) +H_2)(I) rightarrow 2PbCrO_4(s) + 2H^+(aq) What is the oxidation number of chlorine in NaClO_2? -1 +1 +3 +5 When NaOH(aq) is added to NiCl_3(aq), a green precipitate forms. Which is the correct net ionic equation for this reaction? Ni^2+(aq) + 2OH^-(aq) rightarrow Ni(OH)_2(s) 2NaOH(aq) + NiCl_2(aq) rightarrow 2NaCl(aq) + Ni(OH)_2(s) 2OH^-(aq) + Ni^2+(aq) + Cl_2^2-(aq) rightarrow 2Cl^-(aq) + Ni(OH)_2(s) 2Na^+(aq) + 2OH^- + Ni^2+(aq) + 2CL^-(aq) rightarrow 2NaCl(aq) + Ni(OH)_2(s) What are the oxidizing agent and the reducing agent in this reaction? Cu(NO_2)_2(aq) + 2V(NO_3)_2(aq) rightarrow Cu(s) + 2V(NO_3)_2(aq) oxidizing agent Cu V(NO_3)_3 V(NO_3)_2 Cu(NO_3)_2 reducing agent V(NO_3)_3 Cu Cu(NO_3)_2 V(NO_3)_2 Which best illustrate how the weak electrolyte HF exists in aqueous solution(water molecules not shown)? What mass of LiF is needed to make 500.0 mL of a 0.500 M solution? 0.250 g 6.49g 13.0g 25.9g

Explanation / Answer

13.

mass of Al2o3 = 3*1/2 = 1.5 mol

answer: A

14. B

15. C

16. A

17. B

18. A

19. B

20. C

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