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A box of nails contains 90 straight nails and 10 nails too bent to be used. You randomly select 10 nails from the box. What is the probability that you removed 8 straight nails and 2 bent nails? To find the probability, first derive a general expression using the following notation:
N=Ns+Nbn=ns+nb
where N is the total number of nails in the box, and Ns and Nb are the number of straight and bent nails, respectively, n is the total number of nails removed from the box, and and ns and nb are the number of straight and bent nails removed from the box, respectively.
the difference between E and Z formations for organic molecules and how to establish priority according to the Cahn-Ingold-Prelog rules.
Chemistry - Estimation of Mass Required in a Reaction, With the reaction, CaCO3+2Hcl->CaCl2+H2O+CO2. Using percent by mass what is the weight of HCl needed to react
how many mL of chlorine gas are required to produce 0.50L of hydrogen chloride gas(HCl) at constant temperature and pressure?
How many milliliters of 0.5 mg/mL BSA will you use in each tube to get the range of 0-50 micrograms that you want?
In addition to long strings of carbon atoms, another common type of carbon structures, which are generally pretty smelly, come in the form of
The half-life for the radioactive decay of [U]-238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the [U]-238 atoms in a sample of [U]-238 to decay?
If 3 moles of NaCl are needed to produce 1 mole of AlCl3, how many grams of NaCl are needed to produce 200 grams of AlCl3? Show all of your work/calculations.
how many atoms of hydrogen are contained in 35 molecules are butric acid?
The % ionization of a weak acid always declines in a solution that contains the salt of the anion relative to a solution of the acid alone. For example the % dissociation of the acetic acid is less in a solution that contains sodium acetate than i..
If 18.5 mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentration of the ammonia.
How much heat in kilojoules is evolved in converting 1.50 mole of steam at 150 deg celsiys to ice at -35.0 deg. celsius? The heat capacity of steam is 1.84 J/g. deg celsius.
What mass of sucrose should be combined with 493 g of water to make a solution with an osmotic pressure of 9.00 atm at 320 K? (Assume the density of the solution to be equal to the density of the solvent.)
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