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A chemist is trying to recognize a human hormone that controls metabolism by finding its molar mass. A sample weighing 0.546 g was dissolved in 15.0 g benzene as well as the freezing point depression was determined to be 0.240 oC. Compute the molar mass of the hormone. T = Kf •m where Kf for benzene is 5.12 oC/m
A precipitate of calcium phosphate is in contact with 653.9 mL of water. How many grams of calcium ion are present in the solution
What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2) and 85.0 g H2O? Kf of water is 1.86°C/m.
Three resonance structures of the following cation are possible. One resonance form is given below, but it is incomplete. Complete the given structure by adding non-bonding electrons and formal charges where necessary
When some ionic compounds dissolve, not all of their bonds dissociate. What kind of conductivity would you expect such a solution to have?
Explain how to prepare 0.250 L of a 0.500 M CuSO4 solution. 1. Measure out 0.500 moles of CuSO4 solid 2. Measure out 20.0 g of CuSO4 solid 3. Measure out 0.500 moles of CuSO4 solid and add water until a volume of 1.0 L is reached 4
A 325 mL sample of solution contains 25.3 grams of CaCl2. Calculate the molar concentration of Cl- in this solution.
Calculate the amount of heat energy in joules required to heat 50.0g of each substance from 25.0 c to 37.0 c
Calculate the theoretical amount of oxygen based on your starting mass of reactant. Then calculate the percent yield when you compare your actual yield to this theoretical yield.
Describe how the results from this control experiment would be incorporated into the data analysis to the correct for this error.
What is the mass of a glucose solution that fills a 1.00 {\rm L} intravenous bottle if the density of the glucose solution is 1.15 g/mL?
If 42.1 mL of 1.02 M sodium hydroxide, measured using a graduated cylinder, is placed in a beaker filled with 300 mL of DI water, what is the concentration of the diluted NaOH solution
How are the following aspects of a reaction affected by the addition of a catalyst. 1) activation energy of the reverse reaction A) Increased B) Decreased
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