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Realize the calculus to preparate 25 mL of a saline solution 7.4% from 50 mL of a saline solution 11.7%.
A 2.00 L glass soda bottle filled only with air is tightly capped at 24 C and 744.0mmHg. If the bottle is placed in water at 75C what is the pressure in the bottle?
A student added calcium ion, ca2+ to an aqueous solution and observed formation of a precipitate. Addition of HNO3 had no effect on the precipitate. What anion wa present in the original solution? Explain your answer
you add 1.65L of water to 112g of sodium acetate. what is the molarity of the sodium acetate in the solution
What is the second step in the scientific method? 1-to analyze the data, and create a theory to confirm the experimental observations 2- to analyze the data, and propose a tentative hypothesis to explain the experimental observations.
How much energy is evolved by 44g of copper (spht= .38 J/gC) if it's temp falls from 333 K to 280K
if a 2.5 l reaction vessel initially contains 725 torr of cyclopropane at 485c how long will it take for the partial
an adult person radiates heat to the surroundings at about the same time as a 100-watt lightbulb. what is the total amount of energy in kcal radiated to the surroundings by an adult in 24 hrs?
Concentrated sodium hydroxide (NaOH) is 19.4 M, has a density of 1.54 g/mL, and is a strong electrolyte. What is the molality of 19.4 M NaOH? Assume NaOH(aq) dissociates completely to produce two moles of ions per mol NaOH
you have a 1.0cm3 sampleof lead and a 1.0cm3 sample of glass. you drop each in a separate beaker of water. how do the
A standard solution was made when 1.276g of pure copper wire (MM= 63.546g/mol) was weighed, dissolved in concentrated HNO3, and diluted to 1.00x102mL. What is the concentration of the stock solution
A certain solid metallic element has a density 7.87 g/cm3 and a molar mass of 55.85 g/mol. It crystallizes with a cubic unit cell, with an edge length of 286.7 pm. calculate the number of atoms per unit cell.
calculate the equilibrium constant (Keq) at 298 K for the reaction below. Use F = 96,500 C/mol for Faraday's constant and R = 8.314 J/(mol K) for the gas constant. 1 Mn2+(aq) + 2 Na(s) 1 Mn(s) + 2 Na+(aq)
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