Count the significant digits in each of these measurements: number of significant digits ? measurement 82300. kg 0.005100 J -2 - 3.0 x 10 kJ/mol -1 mL 3.1 x 10

Construct a standard curve (absorbance versus protein concentration in the standards) Conc. (mg/ml) 0 0.25 0.5 0.75 1.0 Absorbance 0.000 0.126 0.249 0.361 0.464

I. Give concentration in units of mg/ml for the following solutions. 50 g/liter 0.5 g/ml 5mg/ml 500 mg/liter Show your work

A microorganism was cultured in a flask containing a liquid medium. Samples were taken hourly and number of cells counted using a counting chamber. The data are provided below in cells per mL. Draw a growth curve in Excel and use it to calculate generation time. The answer must be provided as a number (in minutes). Time Cells per mL 81235849 0 6 7 10 26 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2.00E+04 2.20E+04 2.30E+04 2.40E+04 3.10E+04 5.00E+04 8.06E+04 1.30E+05 2.09E+05 3.38E+05 5.44E+05 8.78E+05 1.41E+06 2.28E+06 3.68E+06 5.93E+06 9.56E+06 1.54E+07 2.48E+07 4.01E+07 6.46E+07 1.04E+08 1.68E+08 2.71E+08 2.72E+08 2.73E+08

83 m = _____________ cm                               584 µL  = ________________ mL   08 g = ______________ mg                             0.983 nm  =_________ mm     2500 cm = _____________ mm       417 mL   = ________________ L   15 mL = _____________ kL         843.2 cg = ________________ g Convert the values

If 46.5 mol of an ideal gas occupies 95.5 L at 373 K, what is the pressure of the gas? pressure: I atm

You are asked by the pharmacist to add 45 mEq of Ca Gluconate in an IV bag of D5W 1000mL. You have a concentrated vial of Ca Gluconate 4.4 mEq/mL, 50 mL. How many mL of this concentrated vial needs to be added to the IV bag?

Units of volume 26 0.15 litres (L) to millilitres (mL)

Determine and report the pressure of collected hydrogen gas in atmospheres. Report this result to one more digit than allowed by applying the rules of significant figures. (1 atm = 760 mm Hg, an exact conversion factor.) Determine the moles of hydrogen collected by substituting the appropriate quantities into the ideal gas equation and solving. Report this result to one more digit than allowed by applying the rules of significant figures. Notes: the gas temperature is the same as the listed temperature; R = 0.082057 L-atm/mol-K. Be mindful of units. Determine the experimental atomic mass of Cu. Round this result to the correct number of significant figures. Determine the percent relative error (= ????????????−?h????????? ? 100). The molar mass of Cu is 63.546 g/mol. Mass of copper before electrolysis 6.008 g Mass of copper after electrolysis 5.860 g Volume of H2 collected 58.9 mL Pressure of H2, PH2 720.8 mm Hg Temperature 24.0 oC

Please make sure answers is giver to 3 significant figures.