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A solution of ethanol (C2H5OH) in water is prepared by dissolving 62.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 235.0 mL of solution. What is the molarity of the ethanol in this solution?
Suppose that an 90.0 g laboratory animal ingested 10.0 mg of a substance that contained 2.55% by mass Pu-239, an alpha emitter with a half-life of 24,110 years. a) What is the animal's initial radiation exposure in Curies?
A piece of magnesium (mass=16.2 grams) reacts completely with 10.7 grams of oxygen. In the second reaction you have 61.4 grams of magnesium and 103.7 grams of oxygen
Assume that you are an experienced organic chemist with perfect recrystallization technique. You recrystallize 10g of impure naphthalene from Ethanol in Corvallis, OR (elevation; sea level) and recover 7.4g of pure naphthalene.
A student determined the freezing point of pure t-butyl alcohol following the procedure given in this experiment . Because of an experimental error, the freezing point temperature that she obtained was higher than the correct value
Draw the major organic product formed by reaction of 3-hexyne with the following reagent
The heat of vaporization of water at 100°C is 40.66 kJ/mol. Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100°C.
what is the main difference between, 2s or 3s or 4s orbitals, or 2p, 3p or 4p. is it just that they are bigger
NO(g) + O2(g)-------- 2NO2 0.85 mol of NO is mixed 0.494 mol of O2 Calculate the number of moles of NO2 produced and Limiting reactant
Write a complete balanced equation for the neutralization reaction between HCl and NaOH.
A saturated aqueous solution of lead(II) iodate, Pb(IO3)2, contains 3.1 x 10-5 M Pb+2 at 25°C. Assuming an ideal solution, and assuming no reaction of the ions with water, calculate the Ksp of lead(II) iodate at that temperature.
Monochloroacetic acid (HC2H2ClO2) is a skin irritant that is used in "chemical peels" intended to remove the top layer of dead skin from the face and ultimately improve the complexion.
The human eye is able to detect as little as 2.35 × 10-18 J of green light of wavelength 510 nm. Calculate the minimum number of photons of green light that can be detected by the human eye. Physical constants can be found here.
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