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Ice and water are combined in a insulated vessel with negligible heat capacity. You know the preliminary amount(kg) of both the ice and water and also their initial temperatures.
an element crystallizes in a body-centered cubic lattice. the edge of the unit cell is 3.17 a and the density of the
Calculate the pH during the titration of 29 mL of 0.2 M HNO3(aq) with 0.15 M NaOH after 10 mL of the base
During a breath, the average human lung expands by about 0.50L. If this expansion occurs against an external pressure of 1.0 atm, how much work in J is done during the expansion?
The value of deltaH for the reaction CH3OH (l)---->CO (g) +2H2 (g) is +128.1 kJ. How many kJ of heat are consumed when 5.10 g of H2 (g) is formed as shown in the equation
If the water in a well has 1000.0 mg/L of CaCO3 dissolved in it, How many grams of Na2C2O4 could you mix with 100.0 mL of that water before a precipitate would form
Emma is analyzing a sample which contains some zinc in it. The sample is .198 g. She reacts it with an excess of hydrochloric acid and measures hydrogen gas produced. The determination shows the sample to be 84% zinc.
Sports drinks are beverages designed to replenish water, salts, sugars and other nutrients. A particular sport drink contains 600 ppm sodium by mass. How many mg of sodium would be in a 16.0 oz bottle of this beverage
A gold alloy has a density of 12.4g/ml and contains 75%gold by mass. calculate the volume of this alloy that can be made from 255 g of pure gold.
The decay of radioactive elements follows first-order kinetics. Therefore, the rate of decay can be described by the same integrated rate equations and half-life equations that are used to describe the rate of first-order chemical reactions.
A major source of iron is from the mineral magnetite which is 72.4% iron by mass. If magnetite has a density of 5.20 g/cm3, how many cubic meters
What is the pH of a solution that is 0.75 M in sodium acetate and 0.50M in acetic acid? (Ka for acetic acid is 1.85 x 10-5).
Write a complete mechanism of reaction of 2,4-dinitrophenylhydrazine with cyclohexanone. (show electron lone pairs and formal charges and show electron flow using curved arrows)
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