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A solution is prepared by mixing 2.17 g of an unknown non-electrolyte with 223.0 g of chloroform. The freezing point of the mixture is -64.1 C , while the freezing point of pure chloroform is -63.5 C . The value of Kf for chloroform is -4.68 K/m. Find the molar mass of the unknown.
For steady flow in a heat exchanger at just about atmospheric pressure, explain what is the heat transferred. Explain when 20 mol of ammonia is heated from 100 to 800 deg. C
the excess HCl required 5.99 mL of 0.0983 M NaOH for titration. Calculate the percentage of nehohetramine in the sample.
Question- Magnesium has three naturally occurring isotopes, 24Mg (isotopic mass 23.9850 amu, abundance 78.99%), 25Mg (isotopic mass 24.9858 amu, abundance 10.00%), and 26Mg (isotopic mass 25.9826 amu, abundance 11.01%). Calculate the atomic mass o..
Distance between two consecutive peaks or troughs. Frequency () Number of waves per second that pass through a given point in space. How are frequency and wavelength related? Example: Are gamma rays ( = 10-12 m) a form of high or low frequency rad..
Calculate the amount of heat liberated (in kJ) from 383 g of mercury when it cools from 61.0°C to 11.0°C.
Predict the mass of hydrogen gas produced when 2.73 g of aluminum reacts in a single replacement reaction with excess sulphuric acid.
What test can u perform to ensure that a liquid distance is pure?
Question- A 0.140-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. 1) What is the concentration of Ni2 ions at equilibrium
Calculate the standard entropy, ΔS°rxn, of the following reaction at 25.0°C using the data in this table. The standard enthalpy of the reaction, ΔH°rxn, is -633.1 kJ·mol-1.
Determine the mass percent of CH3COOH in this solution if density of vinegar is 1.01 g/mL? Also calculate mole fraction of acetic acid in this solution and molality of this solution?
Considering the chemical equation for the reaction between these two substances, why do you think it is okay to pour the contents of the reaction mixture down
A mole of hydrogen atoms contains 6.02X10^23 atoms, A section of outer space contains 25 atoms. How many moles of hydrogen is this
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