66. In a 030 MK2sou solution, what is the total concentration of ions? A. 1.8 M
ID: 929026 • Letter: 6
Question
66. In a 030 MK2sou solution, what is the total concentration of ions? A. 1.8 M ions B. 2.1 M ions C. 0.30 M ions D, 090 M ions E. 0.60 M ions 67. A solution is made by dissolving 50.0 grams of A (molar mass of A-150.0 g/mo) in 600.0 grams of water. What is the molalin of the solution? A- 0.250 m B, 0,556 m 5.00 m D. 0.513 m E. 7.69 m 68, What mass of KzCOs do you need to add to a 750.0 mL volumetric flask to obtain a 2.11 M KzCO solution after appropriate addition of water to the flask? A. 158 g B. 292 g C. 138 g D. 219 g E. 104 g 69. A solution is made by dissolving 10.00 grams of (moth balls, mass 128.2 g/mol) in 200.0 grams of benzene (molar mass 78.12 g/mo). The normal boiling point of benzene is 80.1°C and K+ (benzene) 2.53 °C/m. What is the boiling point of the solution? A. 79.1 ec B. 81.1 C C. 80.5 °C D. 86.6 °C E. 101.0 °CExplanation / Answer
66) 2*0.3+1*0.3=0.6+0.3=0.9M(since 2 K+ ions and 1 sulphate ion)
67)molality=(50*1000)/(150*600)=0.556m
68)2.11=(w/138)*(1000/750)
w=219g
69)T-80.1=(10/128.2)*(1000/200)*2.53
T-80.1=0.986
T=80.9860C=810C
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