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Question:
A 0.879g of a sample a CaCl2*H20/K2C2O2 solid salt mixture is dissolved in 150mL of deionized water. A precipitate forms which is then filtered and dried. The mass of this precipitate is 0.284g. The limiting reagent in the salt mixture was later determined to be CaCl2*2H20
(a) write the molecular form of the equation for the reaction.
(b) Write the net ionic equation for the reaction.
(c) How many moles and grams of CaCl2.2H2O reacted in the reaction mixture?
(d) How many moles and grams of excess reactant, K2C2O4.H2O, reacted in the mixture?
(e) How many grams of the K2C2O4.H2O in the salt mixture remain unreacted (in excess)?
(f) What is the precent by mass of each salt in the mixture?
A quantity of 6.0 moles of an ideal gas is reversibly heated at constant volume from 17 C to 35 C. Calculate the entropy change.
Which of the following statements correctly describe CH3COOH (acetic acid)? -There are 2 atoms of carbon in one molecule of acetic acid -The molar mass of acetic acid is 29.02 g/mol.
Question- By substituting two hydrogen atoms on the benzene ring with methyl groups, Part 1- Write line-angle formulas of all constitutional isomers.
Question- In a molecular beam experiment to measure collision cross-sections it was found that the intensity of a CsCl beam was reduced to 60 per cent of its intensity on passage through CH2F2 at 10 ?Torr, but that when the target was Ar at the sa..
The solubility of the ionic compound M2X3, having a molar mass of 214 g/mol, is 3.18 10-7 g/L. Calculate the Ksp of the compound.
Ferrocene eluted from the column first and acetylferrocene second, but ferrocene ended up as the higher of the two spots during TLC analysis. Explain.
A certain first-order reaction has a rate constant, k, equal to 2.1 x 10-5 at 355 K. If the activation energy for this reaction is 135 kJ/mol compute the value of the rate constant (s-1) at 550 K.
100g of orange juice is said to contain about 50mg of ascorbic acid. How much of a 2E-4M DCPIP titrant should be required to titate a 100g sample. What would be a good sample size.
it absorbs 32.60 kj of heat from its surroundings. what is its final temperature in C (specific heat .9930 J g C for Al)
The ionization energies of rubidium and silver are 4.18 and 7.57 eV, respectively. Calculate the ionization energies of an H atom with its electron in the same orbitals as in these two atoms and account for the difference in values
a compound is found to be 30.45n and 69.55 o by mass. if 1.63g of this compound occupy 389ml at 0.00 celsius and 775 mm
a student was asked to identify an unknown hydrate by following the procedure described in this module. after heating
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