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A vitamin C 142g/mol tablet weighing 0.562g is crushed as well as dissolved in enough water to form 500mL of solution. Ten milliliters of this solution is after that diluted to 250mL. The absorbance of the solution is 0.241 in a 1cm cell. Explain what is the percentage of vitamin C in the tablet. The molar absorptivity is 7415.
250g of ice at 265k is mixed with 100g of water ar 305k. calculate the final temperature of the mixture. assume that no
2 NO(g) + O2(g) 2 NO2(g) In one experiment 0.633 mole of NO is mixed with 0.354 mole of O2. Calculate also the number of moles of NO2 produced.
Choose the selection which most accurately gives both the value of the angle numbered 21 and the value of the angle numbered 22 in the figure above.
Explain what the fragmentation patterns of the following molecules are List the fragment and the M/z values- 1. Isopropylcyclohexane
Which of the following 5 ions or molecules are NOT planar in its lowest energ form? Carbonate ion, chlorate, xenon dibromide, chlorine trifluoride, xenon tetrafluoride.
How many kJ of heat are needed to completely melt 1.30 moles of , given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.
particulat reaction doubles between 273k and 283k , calculate the value of the activation energy for the reaction.
Explain what is the concentration of a 250.0mL solution that contains 25.0 g of Copper (II) Chloride
what is the molecular equation, ionic equation, and net ionic equation for magnesium reacting with hydrochloric acid
When a container is filled with 3.00 mol of H2 , 2.00 mol of O2 , and 1.00 mol of N2 , the pressure in the container is 465 kPa. determine the partial pressure of O2?
For the reaction, A = B + C, the rate law is k[A]. If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant.
Which of the following would be the best procedure for extracting acetaldehyde from an aqueous layer to the organic layer? a. Extracting the aqueous layer one time with 200 mL of the organic solvent.
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