How many grams of CH_4N_2O are dissolved in a solution containing 150 grams of water which...
A sample of 12 grams of a substance that does not dissociate is dissolved in 80 g of water. The solution freezes at -1.94 ° C. What is the molecular weight of the substance if the cryoscopic constant for water is 1.86 ° C / m?
How many grams of MgCl2 (molar mass = 95.2 g/mol) should be added to 300 grams of water to give a solution that freezes at -3.00°C? Kf of H2O is 1.86°C/m.
6) Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 °C? The freezing point for pure water is 0.0°C and Kf is equal to 1.86 °C/m.
A 1.20 g sample of an unknown compound is dissolved in 60.0 g of benzene. The resulting solution freezes at 4.92 degree C. Calculate the molecular weight of the unknown. Pure benzene freezes at 5.45 degree C\ K_f for benzene is 5.12 degree C/m
How many grams of sodium hydroxide (NaOH) are must be dissolved in 290.0 mL of water to produce a 1.3 M solution?
A solution was prepared by dissolving 1.846 grams of an unknown compound (nonelectrolyte) in 15.75 grams of water (Kf = 1.86 oC/m). The solution freezes at -1.50 oC. If pure water freezes at 0.00 oC, what's the molar mass of unknown compound?
Question #2 -/1 points How many grams of calcium nitrate need to be dissolved in 75 mL of water to form a solution that has a freezing point of -3.2 deg C? grams of calcium nitrate Evaluate Question #3 -/1 points What is the freezing point in °C) of a solution of 8.0 g of carbon tetrachloride, CCl4, in 80.0 g of benzene, C6H6. For benzene, Tp = 5.5°C and Kf = 5.12 deg kg mole?? Freezing point of solution...
2. What is the molarity of a solution in which 38.7 g of NaCl is dissolved in enough water to make a total of 1.00 L of solution? answer 3. What is the molarity of a solution in which 10.0 g of AgNO3 is dissolved in 500. mL of solution? answer 4. How many grams of K2SO4 would it take to make 1.50 L of a 0.500 M solution? answer 5. Calculate the % (m/V) of a 0.0600 L solution...
The boiling point of water is 100.0°C at 1 atmosphere. How many grams of aluminum nitrate (213.0 g/mol), must be dissolved in 279.0 grams of water to raise the boiling point by 0.450°C? Refer to the table for the necessary boiling or freezing point constant. Solvent Formula Kb (°C/m) Kf (°C/m) Water H2O 0.512 1.86 Ethanol CH3CH2OH 1.22 1.99 Chloroform CHCl3 3.67 Benzene C6H6 2.53 5.12 Diethyl ether CH3CH2OCH2CH3 2.02
Exercises (Mass Percent) 1. 3.0 grams of sugar are dissolved in 150 g of water What is the mass percent of sugar in the solution? 2. A 200-gram solution of alcohol contains 180 mL of water. What is the mass percent of alcohol? (Remember water's density.) 3. How many grams of NaBr are needed to make 50 g of a 5.0% solution? 4. How many grams of LiOH are needed to make 25 g of a 4.0% solution? 5. What...