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What is the mass of NH3 in a 80.0 cm^3 sample that has a density of 0.92g/cm^3 and consists of 20%(by mass) of NH3
An empty gasoline can with dimensions 15 cm by 40 cm by 12.5 cm is attached to a vacuum pump and evacuated. if the atmospheric pressure is 14.7 lb/in^2.
The oxidation of nitrogen monoxide gas by molecular oxygen to form nitrogen dioxide gas is reversible and exothermic. Predict the effect of each of the following changes on the position of the equilibrium and a relative change in Kc.
A standard NaOH solution is contaminated with Na2CO3. In the titration of 50.00 mL of .1002 M HCl solution, 32.00 and 32.50 mL of base are required to reach the methyl orange and Phenolpthalein end points,
A volume of 75mL of H2O is initially at room temperature (22C). A chilled steel rod at 2.00 C is placed in the water. If the final temperature of the system is 21.0 Celsius, what is the mass of the steel bar?
Calculate the equilibrium constant for this overall reaction: CH3COOH(aq) + IO^-(aq) CH3COO^-(aq) + HIO(aq) K=
The meniscus of mercury curves downward at the edges. Explain using the concepts of cohesion and adhesion.
radioactive isotopes often occur together in mixtures. suppose a 190 sample contains with a half-life of 12 days and
If I add enough water to the above buffer to make the total volume 1.00 L, what's the new pH. How many milliliters of 0.25 M HCl will be needed to change the pH of the dilute buffer by 1 pH unit
Sulfuric acid,H2SO4 is a strong diprotic acid. A sample of aqueous solution of sulfuric acid has a concentration of 0.0582 M. Calculate the concentration of H3O+ ion, HSO4- and (SO4)2- ions from this solution. Ka = 1.18 * 10^-2
The inventor proposed the revolutionary design of the new engine based on the heat stored in the ocean. The inventor plan is to mount it on a boat in San Francisco and set off on a journey across the Pacific Ocean. Heat is extracted from the ocean
at room temperature 20 degrees celsius milk turns sour in about 64 hours. in a refrigerator at 3 degrees celsius milk
Whats the melting point would be if you mixed acetanilide with 10 % by weight of naphthalene(acetanilide mp 113.5-114; naphthalene 80-82)
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