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1) How many moles are in 34.5 g of nitrogen gas? a) 1.23 mol b) 966.69 mol c) 2.46 mol d) 483.34 mol 2) How many grams are in 6.5 moles of glucose? a) .036 g b) .038 g c) 1182.93 g d) 1171.04 g 3) What mass of sodium oxide can be formed when 69 grams of sodium react with oxygen?: __Na + __O2 ->  __Na2O a) 64 g b) 93 g c) 73 g d) 87g 4) Nitric acid, HNO3, is used in the production of trinitrotoluene, (TNT), an explosive. How many moles of nitric acid are required to react with 4.5 moles of toluene (C7H8): __𝐶7𝐻8 + __𝐻𝑁𝑂3 → __𝐶7𝐻5𝑁3𝑂6 + __𝐻2 a) 22.9 mol b) 23.4 mol c) 13.5 mol d) 12.3 mol 5) What is the percent yield of TNT if only 954 grams were produced? __𝐶7𝐻8 + __𝐻𝑁𝑂3 → __𝐶7𝐻5𝑁3𝑂6 + __𝐻2 a) 99.9% b) 93.3% c) 69.8% d) 97.7% 6) What is the molarity of a 250 mL solution that is created by diluting a stock solution of 100 mL .58 M Mg(𝑂𝐻)2? 𝑀𝑔(𝑂𝐻)2 + 2𝐻𝐶𝑙 → 𝑀𝑔𝐶𝑙2 + 2𝐻2𝑂 a) 0.23 M b) 0.87 M c) 0.05 M d) 0.66 M 7) Based on this chemical reaction, how many grams of MgCl2 will be produced if the diluted solution from question 6 reacts with excess HCl? a) 3.27 g b) 11.88 g c) 5.48 g d) 12.58 g 8) What type of chemical reaction occurs in question 6? a) Double Replacement b) Acid-base  c) Synthesis d) Combustion 9) Write the net ionic equation for a solution of sodium chloride and lead (II) nitrate. What will be the precipitating compound (if any)?  a) NaCl b) NaNO3 c) PbCl2 d) Pb(NO3)2 10) List the spectator ions for the reaction in question 9. a) No3-, Na+ b) Pb2+, Cl- c) Pb2+, Na+ d) NO3-, Cl-

Exam Three Review CH 7-8

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