Please help Which of the following aqueous solutions has the highest boiling poi
ID: 841375 • Letter: P
Question
Please help
Which of the following aqueous solutions has the highest boiling point? 0.2 m KCl 0.2 m Na2SO4 0.2 m Ca(NO3)2 A and B. B and C. Which of the following aqueous solutions has the lowest freezing point? 0.18 m KCl 0.15 m Na2SO4 0.12 m Ca(NO3)/2 pure water 0.20 m C2H6O2 (ethylene glycol) What is the concentration of O2(g) in water at 25 degreeC exposed to a partial pressure of oxygen of 0.49 atm? The Henry's law constant for oxygen gas at 25 degreeC is 1.3 times 10-3 mol/L middot atm. How many grams of ethylene glycol antifreeze (C2H6O2, FM 62.0 g/mol) would you add to your car radiator containing 15.0 L of water if you needed to protect your engine to -17.8 degreeC? (For water. Kf = 1.86 degreeC/m.) 15.0L = 15.0 Kg water 31 g of potassium nitrate (KNO3, FM 101.1 g/mol) is dissolved in 1.5 kg water. What is molality of the solution? The solubility of gases in water usually decreases with increasing pressure. increasing temperature. decreasing temperature. The solubility of CO2 gas in water increases with increasing temperature. decreases with decreasing temperature. decreases with increasing temperature. is not dependent on temperature. Consider a solution made from a nonvolatile solute and a volatile solvent. Which statement is true? The vapor pressure of the solution is always greater than the vapor pressure of the pure solvent. The boiling point of the solution is always greater than the boiling point of the pure solvent. The freezing point of the solution is always greater than the freezing point of the pure solvent. Nonvolatile = very low vapor pressure, well not evaporate Volatile = high vapor pressure = well evaporate easilyExplanation / Answer
1)E
2)B
3) 1.3*10^-3 *0.49
=0.637 *10^-3
4)decrease in freezing point=molality* kf
==>17.8=(x/62*15)*1.86
x=8900 grams
5)molality=number of solute/weight of solvent
=31/(101.1*1.5)
=0.2044 m
6)B
7)C
8)B