Balance the following reaction and determine the coefficient for water. __P2O5(g) +  __H2O(l) →  __H3PO4(aq)

  Apply the Hess’s Law and use the Data table below to calculate the ΔH°rxn, in kJ, for: Sr(OH)2(s) + 2HNO3aq) => Sr(NO3)2(aq) + 2H2O(l) Show work for Partial Credit: take a picture of your work, save it to your Canvas files, and upload your answer in the Work and Calculations assignment provided. Substance  ΔHf° (kJ mol–1) Sr(OH)2(aq) -1007.3 HNO3(aq) -206.63 Sr(NO3)2(aq) -962.32 H2O (l) -285.83  

A sample of gas occupies a volume of 160.0 L at 155° What will be the volume of gas in mL when the temperature drops to 55° C at the same pressure?

Write and balance the equation and determine the mole ratio of reactants. Use this information to answer the following questions: How many moles of NaOH are present in 255 mL of 2.7471M solution?[A] How many moles of H3PO4 are needed to completely neutralize this base?[B]

1. The following table was filled by the student during the measuring of the absorbance of a 100 mM solution of Ni2+ ion. Wavelength Absorbed (nm) Color Absorbed Color Observed Absorbance of solution 410 Violet Yellow-Green 0.23 430 Blue-Violet Yellow 0.52 480 Blue Orange 0.07 500 Blue-Green Red 0.03 530 Green Purple 0.01 560 Yellow-Green Violet 0.01 580 Yellow Blue-Violet 0.01 610 Orange Blue 0.03 680 Red Blue-Green 0.16 720 Red-Purple Green 0.19 Select a correct wavelength to measure the absorbance of nickel-containing solutions and justify your answer (4pts):           2. The following calibration table was built in order to calibrate the colorimeter: Test tube # Concentration of Ni2+ ions, M Absorbance Blank 0.000 0.00 Test tube 1 0.020 0.12 Test tube 2 0.040 0.20 Test tube 3 0.060 0.34 Test tube 4 0.080 0.44 Test tube 5 0.100 0.51 Test tube 6 0.120 0.62 Test tube 7 0.140 0.70 Test tube 8 0.160 0.80 Test tube 9 0.180 0.96 Test tube 10 0.200 1.10 Report the equation of the trendline in terms of Absorbance, Molarity and molar absorptivity (you do not need to show the graph) and the value of R2(6pts, report your answer):   3. The 15.0 g sample of Zn-Ni alloy was dissolved in the nitric acid and diluted to 250.0 mL. The measured absorbance of the solution was 0.75. Use the calibration curve equation to calculate and report:Molarity of the solution (3 pts, report your answer): %Ni in the alloy (3 pts, report your answer): Show work for Credit: take a picture of your work, save it to your Canvas files, and upload your answer in the Work and Calculations assignment provided.

Consider the following reaction: NaCl(aq) + AgNO3(aq) => AgCl(s) + NaNO3(aq)  According to the reaction stoichiometry how many number of moles of silver chloride will form if 3.0 moles of sodium chloride react with the excess of silver nitrate? of moles of AgNO3, silver nitrate?

 Edwin uses a [classifier] classifier while describing his boss’s [mustache].

Which handshape is often used to show the location of a building?

Who was waiting for Edwin when he arrived? 

In ASL, we sign details by giving specific information first then more general information.