11. How many grams of BaCl2 (molar mass = 208.2 g/mol) do you have to add to 250
ID: 551931 • Letter: 1
Question
11. How many grams of BaCl2 (molar mass = 208.2 g/mol) do you have to add to 250.0 mL of water to have a chloride ion concentration of 0.0125 M? a. 0.325 g b. 1.30 g c. 0.163 g d. 5.21g 12. The molar enthalpy of fusion for bromine is 10.6kJ/mol. Which of the following conversions requires an input of 10.6kJ of heat? a. one mole of bromine from solid to liquid b. one mole of bromine from liquid to solid c. one kg of bromine from solid to liquid d. one kg of bromine from liquid to solid 13. Use the activity series to determine which of the following reactions will occur a. 3H90 + 2 Cr(NO3)3(aa) 3Hg (NOJ2 + 2Cr(s) d. 2AgNO3(a) + Pb(s) e. 3FeBr2(aq) + 2Au(s) 2Ag(s) + Pb(NO3)2(aq) 3Fe(s) + 2AuBr3(aq) 14. Sodium does not occur in nature as Nas)because a. it is easily replaced by silver in its ores b. it is easily reduced to Na c. it is easily oxidized to Na d. it reacts with water with difficulty e. it undergoes a disproportionation reaction to Na and Na* 15. Which system does not transfer mass but does transfer energy? a. mass transfer system b. isolated system c. closed system d. nonenergy system e. open system 16. Which of these are not state functions? a. volume b. temperature c. pressure d. heat e. energyExplanation / Answer
11. no of moles of Cl^- = molarity * volume in L
= 0.0125*0.25 = 0.003125moles
mass of Cl^- = no of moles *gram molar mass
= 0.003125*35.5 = 0.11g
2 moles of Cl^- present in 1 mole of BaCL2
0.11 moles of Cl^- present = 1*0.11/2 = 0.055 moles of BaCl2
mass of BaCl2 = no of moles * gram molar mass
= 0.055*208.2 = 11.45g
d. 5.21g
12.a. one mole of bromine from solid to liquid.
13.b , d answer
14.c
15.b
16.d. heat
work and heat are path fuctions
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