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A series of caffeine standards ranging from 40-200 mg/L will be used to prepare a calibration curve for an HPLC analysis. The average brewed cup of coffee contains 453 mg/L caffeine. What volume (in ml) of coffee should be diluted to 25ml prior to analysis using only standard transfer pipets with integer values from 1-10ml?
State what substances (if compounds, give their formulas) exist in each region. Label each substance in each region as solid, liquid, or gas.
A sample of Oxygen is collected in a 206 mL container over water at 15C, and the barometer reads 793 torr. What volume would the dry gas occupy at 704 torr and 15C? Water's partial pressure at 15C is 12.8 torr. Answer in units of mL.
Chromatography in the presence of 6 M guanidine hydrochloride and 10mM 2-mercaptoethanol yields peaks of Mr 34000 and 26000. Explain what can be determined about the structure of this protein from this data.
By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life ..
Find either the wood oak or pine if The given density of oak = 0.9 g/cm 3 , the density of pine = 0.4g/cm 3 .
Its a cyclohexanol with an oh on the second carbon at the top and a cl on 4 directly opposite, what is the name
What volume of O2 (g) is consumed in the combustion of 75.6L C3H8 (g) if both gases are measured at STP?
If the presure of 50.0 mL of oxygen gas at 100oC increases from 735 mm Hg to 925 mm Hg, what is the final volume? Assume the temperature remains constant.
Estimate the amount of product that was lost in the filtrate, assuming that the volume of the reaction mixture was 1.0 mL when you collected the product by vacuum filteration.
A sample of pure NO2 is heated to 388C at which temperature it partially dissociates according to the equation.
Write the electron configuration for each of the following. (Type your answer in noble gas notation using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2 and using the format CO2 for CO2.)
Given Radon has a density of 9.73 g/L, How many cubic Nanometers of radon would you need if you wanted 43.780g of radon?
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