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Human hairs have diameters between 17 and 180 μm. For a hair that has a 72.0 μm diameter, how many can fit between a pair of teeth on a comb that are 0.150 inches apart ? Assume the ideal case where the hairs line up exactly side by side with no overlap. Give an integer as an answer, do not include a fraction of a hair.
The disinfectant hydrogen peroxide (H2O2) decomposes to form water and oxygen gas.How much O2 will result from the decomposition of 3.21 mol of hydrogen peroxide?Answer in units of mol.
a saturated solution of nickelii sulfide contains approximately 3.6 multiplied by 10-4 g of dissolved nis per liter at
write the net ionic equation for the reaction that takes place when the following aqueous solutions are mixed. If you think no reaction occurs, write NR
Write a balances Chemical equation showing how you could prepare each of the following salts from an acid-base reaction:KNO3,NaBr and Cas.
if the initial water level in the graduated cylinder is 21.2 ml and the level rises to 27.7 ml after the object is placed in the cylinder, what is the volume of the object?
The radius of a Cesium (Cs) atom is 2.62 angstroms. How many Cs atoms would have to be laid side by side to give a row of Cs atoms 1 Inch long
Using butane as your only carbon source, please propose a synthesis to make trans-2-ethyl-3-(1-oxoethyl)oxirane. any common reagent
The reaction 2A + B --> C + D has an activation energy of 80.0 kJ/mol. At 320°C, the rate constant k = 1.80 x 10-2 L mol-1 s-1. What would be the value of k at 450°C?
The most probable radius is one measure of the size of an orbital. For s and p orbitals, how does the size depend on n.
If 10500 L H2 gas is reacted with an excess of N2 gas at 200 atm. and 500 C, how many moles of ammonia gas would be produced, assuming a 15% yield?
question a substance contains 35.0 g nitrogen 5.05 g hydrogen and 60.0 g of oxygen. how many grams of hydrogen are
What masses of NaCl and water are needed to prepare 1000g of a solution that is 0.90% by mass
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