Choose the one alternative that beat completes the statement or answers the ques

Question

Choose the one alternative that beat completes the statement or answers the question. Read the volume of liquid pictured in the buret at the right. Report the buret reading to the correct number of significant figures. 10.200mL 10.65 mL 10.7 mL 10.25 mL 10.3 mL Calculate the change in enthalpy, Delta H for the following reaction NaOH(aq) + HCl(aq) rightarrow NaCl(aq) + H_2O(g) given the data NaOH(s) rightarrow NaOH(aq); Delta H = -46.8 kJ +50.2 kJ -502kJ -46.8kJ +46.8kJ A 5.00 gram sample of compound X was dissolved in 25.00 g of DI H_2O in an 8 oz styrofoam cup. The temperature rose from 19.8 degree C to 25.0 degree C. If the specific heat of the solution is approximately equal to the specific heal of water, 4.184 J/(g. degree C) and the formula weight FW of X is 95.8 what is the Delta H for the reaction X(s) rightarrow X(aq) in J/mol -6.5 Times 10^2 J/mol 1.25 Times 10^4 J/mol -125 Times 10^4 J/mol 425 Times 10^4 J/mol Which molecular equation best represents the reaction that occurs when an aqueous solution of lead nitrate Pb(NO_3)_2 is mixed with an aqueous solution of potassium iodide, KI ? Pb^2+(aq) + 2NO_3^- (aq) + 2K^+(aq) + 2I^-(aq) rightarrow Pbl_2(s) + 2K^+(aq) + 2NO_3^-(aq) Pb^2+(aq) + 2I^-(aq) rightarrow Pb_2(s) No Reaction Occurs K^+(aq) + NO_3^- (aq) rightarrow KNO_3(s)

Explanation / Answer

1. b) 10.65mL

2. b) 50.2 kJ mol-

3. c) 1.25 x 10^4 J mol-

4. a) Pb2+ (aq) + 2NO3- (aq) + 2K+ (aq) + 2I- ----> PbI2(s) + 2K+ (aq) + 2NO3- (aq)

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