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Carbon-14 has a half-life of 5730 years. How long will it take for a sample to decay to only 17% of its original amount?
An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper. How many grams of copper are in the necklace? If 18-karat gold has a density of 15.5
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?
Describe two independent methods for determining the atomic mass of an element. Explain how these method are truly independent.
Calculate the molarity of a solution of glycerol made by dissolving 59.000 mL glycerol at 15 degrees celcius in enough water to make 380.00 mL of solution
what is the osmotic pressure of a homogenous solution at the temperaturenbsp at 25oc as this solution is consisting of
75.0 ml of a solution1.40 m is diluted to a volume of 278 ml. a 139-ml portion of that solution is diluted using 111 ml
If a heated metal block is placed into a beaker of water, what is the relationship between the final temperatures of the water and the metal block?
How many moles of AlCl3 can be produced by letting 918 grams of HCl react?
To account for the high electronegativity difference between hydrogen and fluorine, we reassign the orbital sites in HF in order to create an energy ladder that gives us a logical sequence for assigning electrons
Explain why light intensity is dependent on the distance the detector is from the light source. Describe the mathematical relationship.
Use the Frost Circle to draw the energy levels of the Pi molecular orbitals for this ion, show the electronic configuration and explain why the ion is aromatic.
an aqueous solution contains 12.7 nacl by mass. what mass of water in gramsis contained in 2.5l of the vapor above this
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