1) Calculate the enthalpy change for the reaction: P4O6(s)+2O2(g)>>P4O10(s) given the following enthalpies of reaction: P4(s)+3O2(g)>>P4O6(s) deltaH = -1640.1 kJ P4(s)+5O2(g)>>P4O10(s) deltaH = -2940.1 kJ 2) From the enthalpies of reaction: H2(g)+F2(g)>>2HF(g) deltaH = -537kJ C(s)+2F2(g)>>CF4(g) deltaH = -680kJ 2C(s)+2H2(g)>>C2H4(g)…
1- What mass of Cu(s) is electroplated by running 28.5A of current through a Cu 2+ (aq) solution for 4.00 h ?Express your answer to three significant figures and include the appropriate units. 2-How many minutes will it take to…
Write balanced molecular and net ionic equations for the reactions of a) m a) hydrochloric acid with nickel b) dilute sulfuric acid with iron c) hydrobromic acid with magnesium d) acetic acid,HC2H3O2 with zinc Hard water contains Ca2+, Mg2+, and…
Leucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pKa1=2.36 and pKa2=9.60 1. Draw the condensed structure for leucine, and label all chirality centers with an asterisk. 2. Draw a Fischer projection of L-leucine and…
1. If you wish to extract aqueous acetic acid into hexane, is it more effective to adjust the aqueous phase to pH 3 or pH 8? 2. A chromatogram with ideal Gaussian bands has tr = 17.5 min and w…
For the hypothetical reaction A → B, calculate the average rate of disappearance of A if the initial concentration of A is 0.91 M and the concentration of A after 90 minutes is 0.11 M. 8.9 * 10^-3 M/min -8.9…
A soluble unknown has contaminated your sample. It absorbs the same wavelength as your analyte, Allura Red dye. How will this affect your results, and what type of error is introduced? The measured absorbance will always be lower, creating systematic…
1. If you wish to extract aqueous acetic acid into hexane, is it more effective to adjust the aqueous phase to pH 3 or pH 8? 2. A chromatogram with ideal Gaussian bands has tr = 17.5 min and w…
A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) 2 Hg(l) + O2(g) Hrxn = 181.6 kJ How much heat is needed to decompose 505 g of the oxide? If 270. kJ…
1. Explain why oxygen atoms are neutral. 2. Compare: an atom’s structure to a ladder. What parts of the ladder correspond to the energy levels of the atom? Identify one way a real ladder is not a good model for…
