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A sample of 1.5 g NaWO4 dehydrate is dissolved in 25 mL DI H2O. .75g granulated Zn was added then heated to 70 C. 75 mL of 3M sulfuric acid was then added to consume the Zn then heated to 70 C.
A titration was set up with standard potassium permanganate solution(.020 M). A volume of 17 mL potassium permanganate was need to reach the endpoint.
1) Calculate empirical formula.
If you weigh the lauric acid to the nearest 0.1g and you weigh the unknown solid to the nearest 0.0001g, can you calculate a molar mass of your unknown solid to three significant figures. Show clearly your reasoning.
Write a complete ionic equation and if there is a phase change you need to then write a net ionic equation and list the spectator ions sodium nitrate plus strontium chlorate equals sodium chlorate plus strontium nitrate
calculate the number of moles in 75.0g of lead(II) perchlorate trihydrate, Pb(ClO4)2 * 3H2O
There are three isomeric dichlorocyclopropanes. Their 1H NMR spectra show one signal for isomer 1, two signals for isomer 2, and three signals for isomer
A sample contained a mixture of ZnS and HgS. The amount of ZnS was determined by reacting 11.06 g of the sample with an excess of HCl to release H2S from each compound; ZnS(s) + 2 HCl(aq) ® ZnCl2 + H2S(g) HgS(s) + 2 HCl(aq) ® HgCl2 + H2S(g) If the..
collected over water at 22 degrees C and the total pressure of the wet gas were 710 mm Hg, what would be the partial pressure of the oxygen?
What would happen to the A450 value for a smaple which include : 1mL of 0.0025M Fe(NO3)3 + 1mL of 0.0025M KSCN + 5.0mL of 0.1M HNO3 if you accidentally added 5 drops of disodium hydrogen phosphate
Which of the following pairs has about the same atomic radius?
The solubility of benzoic acid at 0oC is 1.7g/L and at 90oC is 45.5g/L. How much water do you need to dissolve 0.455 g of benzoic acid at 90oC. How much of the original benzoic acid will remain in the solution once the temperature is reduced to 0o..
A water sample is suspected to be contaminated by iron (III) ions. How could you determine if the sample is really contaminated
Air is 21 mole percent oxygen, that is, 0.21 atm oxygen at 1 atm. Suppose the pH of the water is 5.85 and that the concentration of iron(II) in the water is 8.97x 10-5 M, what is the potential of the corrosion reaction under the above conditions a..
The BaSo4 was found to have a mass of 11.96 mg. The molecular weight of the compound was found to be 168 g/mol. Using this data, what is the molecular formula of the C, H, S compound?
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