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24-Determinethe empirical and molecular formulas of each of the following substances. a) Epinephrine (adrenaline), a hormone secreted into the bloodstream in times of danger or stress 59.0% C,7.1% H, 26.2% O, and 7.7% N by mass MW about 180amub) Nicotine a component of tobacco- 74.1% C, 8.6% H, and 17.3% N by mass molar mass = 160± 5 g
As part of a soil analysis on a plot of land, Find out the ammonium content using gravimetric analysis with sodium tetraphenylborate, Na B(C6H5)4-. Unfortunately, the amount of potassium, which as well precipitates with sodium tetraphenylborate, i..
You are given an unknown (solid or solution) and told that it can be one of the other of the compounds in the pairs listed below. Describe a simple chemical test (Not a flame test) using only reagents from our chemistry kits that would enable you ..
The Ksp for silver cyanide is 1.2x10^-8, the Ksp for zinc cyanide is 8.0x10^-12, and the Ksp for aluminum cyanide is 2.3x10^-21. What is the minimum cyanide concentration needed to precipitate each condition
calculate the osmotic pressure in torr of 6.00 L of an aqueous 0.889 m solution at 30.°c, if the solute concerned is totally ionized into three ions.
a sample of 1.0 mole of a perfect gas with cp 20.8 j k-1 is initially at 3.25 atm and 310k. if it undergoes reversible
Gases azomethane decomposes in a first order reaction when heated: CH3NNCH3 --> N2 + C2H6. The rate constant is 0.0216 min-1. If the initial quantity of azomethane in the flask is 2.00 g, how much remains after 0.0500 hour
If High purity benzoic acid [C6H5COOH; H(rxn) = -3227 kJ/mol] is a combustion standard for calibrating bomb calorimeters. If an unknown quantity of the benzoic acid is burn up in the calorimeter (heat capacity = 1365 J/C) containing exactly 800 g ..
Chlorine reacts with water to produce hydrochloric acid. Suppose 2.5 kg of chlorine were added to an olympic-sized swimming pool. How many grams of calcium carbonate would be needed to neutralize
2Mg(s) + O2(g) → 2MgO(s), How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg
consider a glass of299 ml of water at30degc. calculate the mass of ice at -15degc that must be added to cool the water
What are the percetages of each compound. Namphthalene = 17 cm^2 Phenol = 38cm^2 Toluene= 4 cm^2 E) Calculate the retention times for th following componnts from teh following information
The solution density if 1.001g/mL. Calculate the Ca2+ and Mg2+, molarity, molality, mol fraction, and the PPM. Please show examples.
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