# 116 g 44 how many grams of marble will be needed to

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(1.16 g) 44. How many grams of marble will be needed to produce 2.25 L of CO 2 when reacted with HCl at STP? (Marble is 95% CaCO 3 .) CaCO 3 + HCl CaCl 2 + H 2 O + CO 2 (10.57 g) 45. When 4.26 x 10 24 molecules of silicon dioxide is heated with an excess of carbon, 28.7 L of carbon monoxide is produced. What is the percent yield of this reaction? SiO 2 +3C SiC + 2CO (90.54 %) 46. Balance the following using the half-reaction method. Identify the oxidizing agent, the reducing agent, the atom oxidized and the atom reduced. (USE OXIDATION NUMBERS)

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a. MnO + PbO 2 + HNO 3 HMnO 4 + Pb(NO 3 ) 2 + H 2 O b. Na 2 C 2 O 4 + KMnO 4 + H 2 SO 4 CO 2 + MnSO 4 + H 2 O + K 2 SO 4 + Na 2 SO 4 47. Balance the following in acidic solution: (USE NET CHARGES) a. Cu (s) + NO 3 –1 (aq) Cu +2 (aq) + NO 2 (g) b. Mn +2 (aq) + BiO 3 (s) Bi +3 (aq) + MnO 4 –1 (aq) 48. Balance the following in basic solution: (USE NET CHARGES) a. Cr(OH) 3 (s) + ClO -1 (aq) CrO 4 –2 (aq) + Cl 2 (g) b. NO 2 –1 (aq) + Al (s) NH 3 (aq) + Al(OH) 4 –1 (aq)
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