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The following four numbers are estimates of the mass of an object: 5.20 g, 5.66 g, 6.10 g, and 5.35 g. What is the standard deviation to 2 significant figures?
briefly describe how the atomic radii and ionization energies of group 1a1 elements compare with those of group 8a18.
Assuming that one mole of NaN3 produces one mol of N2, what volume, in liters, of nitrogen gas is released from the decomposition of 1.88 g sodium azide? The pressure is 755 torr and the temperature is 24 degrees C.
Given that an atom of a semiconductor has a diameter of 3.12 , what is the maximum number of moles that fit in the channel of a processor chip that is 63.5 long, 84.1 , wide and 465 thick? Assume that the atoms stack in a simple cubic arrangement.
How would you prepare 1.0 ml of a 0.6 mg/ml protein sample from a 1.0 mg/ml protein stock solution in a given phosphate buffer? b) 1 ml of water and 1.0 ml of a solution "x" mixed together is a 1:2 dilution of "x" in water.
calculate the molar concentration of a solution prepared by dissolving 5.4 g of sodium sulfate mw 142 in enough water
A professional emergency responder should be concerned about the following routes of radiation exposure for a person on scene and a person downtown?
Calculate the volume of concentrated HCL (37% by weight, density 1.19 g/mL) that must be added to 500 mL of .10 M ammonia to make
Assuming equal concentrations, rank these aqueous solutions by their freezing point. SnI4, NaNO3, Al(NO3)3, NaSO4. highest to lowest
The J=0 to J=1 transition for carbon monoxide (12C16O) occurs at 1.153 X 10^5 MHz. Calculate the bond length of carbon monoxide.
What mass of NaOH can this buffer neutralize before the pH rises above 4.00?
what is the total mass in grams of a series of samples that have masses of 753mg,
The Ka of acetic acid is 1.85 x 10-5. What would be the pH of a buffer prepared by mixing 50.0 mL of 1.0 M potassium acetate with 50.0 mL of 1.0 M acetic acid?
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