What is the percent yield of a reaction if the product recovered is 21.2 g and the theoretical yield is 28.4 g? A) 74.6 % B) 23.2 % C) 0.746 % What is the limiting reactant in the combustion of 159 g of methane in an open atmosphere? B) methane C) carbon dioxide A) oxygen Which of the following is a redox reaction? A) Zn(s) + 2 HCI(aq) → ZnCl2(aq) + H2(g) B) ZnSO4(aq) + Hg2(NO3)2(aq) → Hg2SO4(s) + Zn(NO3)2(aq) C) HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(1) Which of the following is an acid-base reaction? A) HCIO4(aq) + NaOH(aq) → NaCI04(aq) + H2O() B) Mg(s) + 2HCI(aq) → M9C12(aq) + H2(g) C) Pb(NO3)2(aq) + 2KI(aq) → Pbl2(s) + 2KNO3(aq) Which of the following is a precipitation reaction? A) Ca(s) + 2HCI(aq) → CaCl2(aq) + H2(g) B) H2SO4 (aq) + 2NAOH(aq) → Na2SO4(aq) + 2H2O(/) C) 2NAOH(aq) + MgCl2(aq) →2 NaCI(aq) + Mg(OH)2(s) Which is the correct coefficient for 02 in the following equation after balancing? C;H 10 + _O2 → _CO2 + _H20 A) 15 B) 4 C) 7 D) 5 E) 14

What mass of H2O is produced when 0. 400 mol of KOH react completely in the following equation? KOH + HCl → KCl + H2O a. 90.2 g b. 18.0 g c. 45.1 g d. 7.21 g

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2. If 4.9 grams of magnesium metal react with copper (II) bromide to produce 6.2 grams of magnesium bromide and 3.3 grams of copper metal, how many grams of copper (II) bromide were used up? Part II: Balance the following reactions, identify what type of reaction, and Туpе: Redox? write if the reaction is considered a redox reaction. 1 CH, + Oz- 02 CO2+ H20 1) 2._NazSO,+ Pb(NO:)z NaNO, + PbSO. 3. hydrogen gas + oxygen gas - water 3) Liron (III) sulfide + 4. aluminum _aluminum sulfide + iron 4) 2)