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A gaseous mixture of O2 and N2 contains 39.8\% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 385mmHg
1. the halide ion from HBr will act as the nucleophile in the first step of the reaction 2. the halide ion will act as the nucleophile in the second step of the reaction
The balloon ascends to altitude of 1600 meters and its volume increased to 6.00 L. Assuming that the temp of the gas didnt change during the ascent, calculate the atmospheric pressure at 1600 meters in mmHg.
What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0. 3567 M NaOH? Ka =1.8 × 10-4 for formic acid.
What is the pOH of a solution that is prepared by mixing 25.0 mL of 0.200 M HNO3 and 25.0 mL of 0.150 M KOH
What volume (L) of 0.250M HNO3 is required to neuralize a solution prepared by dissolving 17.5g NaOH in 350mL of water?
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate
The absorbance of the unknown solution before the addition of the standard was 0.5622, and after the addition of the standard was 0.7822.
Balance the equation in acidic solution and determine how much of a 0.850 M K2Cr2O7 solution is required to completely dissolve 5.25 g Cu.
you will need to construct a calorimeter to complete this project. what are the necessary features of a calorimeters. please answers have to be related to chemistry and specifically to this experiment.
What was the volume occupied by the sample under the new conditions - Determine what volume of 3.00M HCl in liters is required to react
While preparing oxalate buffer technician by mistake added 0.1 M of CaC2O4 (pKsp=7.9) to 0.2 M solution of oxalic acid (pKa's 1.25; 4.26). What is the pH of this solution? Is it a buffer
Calcium carbide reacts with water to form acetylene and calcium hydroxide. From the following enthalpy data calculate Delta Hf for CaC2
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