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A 3.900 g sample of an unknown substance was dissolved in 20 ml of cyclohexane. The density of cyclohexane is .779 g/ml. The freezing point depression was 1.8 C compute molar mass.
For each reaction, calculate the mass (in grams) of the product formed when 10.1g of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant.
compute the atomic packing factor for the diamond cubic crystal structure shown in the figure below. assume that
What Mass of K2CO3 must you add to 125 grams of water to prepare a 0.200m K2CO3? What is the mole fraction of K2CO3 in the resulting solution?
Give that 41.05mL of 0.551 M NaOH are needed to react completely with 5.343 g, sand-contaminated sample of benzoic acid (C6H5OOOH, a monoprotic acid,) answer the follwing questions.
Benzoic acid is much stronger than the weak acid phenol consequently benzoic acid reacts with the weak base bicarbonate while phenol does not. using a schematic show a scheme for the total separation of the three compounds in a mixture of benzoic ..
A chemist wishes to prepare 200mL of a saturated solution of BaF2, the concentration of which is 6.3 x 10-3 mol/L. Determine the mass of BaF2 that will be needed to make up the 200mL of the solution.
A sample of zinc nitride, Zn3N2, contains 39.0 g of zinc. How many nitride ions are present
Depict all missing reactants and/or products in the appropriate boxes by placing atoms on the grid as well as connecting them with bonds and including charges where needed. Point out the mechanism by drawing the electron-flow arrows on the molecul..
How many grams of oxyen are consumed, how many grams of CO2 & H2O are produced?
a coffee contains 100 ml of h2o. initial temperature of calorimeter is temperature 23c.if 8.20g of cacl2 is added to
What is the enthalpy of this reaction. Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water.
a sugar water mixture contains 45.8g of sugar and 108.5 g of water. what is the percent by mass of sugar and the
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