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A compound contains only C, H, and O. To analyze the compound, you determine its empirical formula by analysis for C and H, and its molar mass by freezing point depression. (a) What is the empirical formula if a 0.01510 g sample gives 0.01102 g of H2O and 0.04484 g of CO2 on combustion? (b) If you dissolve 1.000 g of the powder in 100.000 g of camphor, you find that the melting point of the solution is 177.05 EC. Pure camphor melts at 179.75 EC. The kfp for camphor is !40.0 deg/molal. What is the molar mass of the white powder? (c) What is the molecular formula of the white powder?
A piece of Al(s) at 94°C is placed in 65g of H2O at 28°C. The Aluminum cools and after equilibrium the final temperature of Aluminum and water is 38°C. What was the mass of the aluminum?
What would happen to the solid benzoic acid product if it was washed with ice-cold aqueous 1M NaOH instead of ice-cold water?
A pound of coffee beans yields 48 cups of coffee. How many milliliters of coffee can be obtained from 1 g of coffee beans?
If you mixed 75 ml of 2 M HCl with 37.5 ml of 4 M NaOH, how many joules of heat would be released? How much would the temperature of the solution increase?
As a reaction progresses backwards toward equilibrium K is the highest value Q attains. e) A reaction with no products present has an infinite Q value.
Calculate whether soils in the region are subject to excessive sulphate loading if the only source of sulphate is rainfall and if the recommended maximum is set at 20 Kg SO4-2 ha-1.
When butane gas, C4H10, burns in oxygen gas, O2, to form carbon dioxide gas, CO2, and gaseous water, 2845 kJ of thermal energy is evolved per mole of butane burned.
A flask contains 0.310 of liquid bromine, . Determine the number of bromine molecules present in the flask.
The work function of copper is 437 kj/mol. Calculate the KE of the ejected electron if the frequency of light is 1.50*10^(15) Hz.
What is the new boiling point point of water if you add 188 grams of magnesium chloride to 1250 g of water.
Calcium hydride, CaH2, reacts with water to form hydrogen gas. CaH2(s) + 2 H2O(l) → Ca(OH)2(aq) + 2 H2(g)
when filled with water (d=1.00 g/cm 3) the flask and it contents weigh 518.3 g. what is the flask's volume?
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