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Convert 23lbf ∙ ft/min^2 to its equivalent in kg ∙ cm/s^2
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- You determine the acetic acid (HOAc) content of vinegar by titrating with a sodium hydroxide standard solution to a phenolphthalein (an indicator) end point. An approximately 5-mL sample of vinegar is weighed on an analytical balance in a weighing boat and this is found to be 5.0268 g. The standard deviation in making a single weighing is 0.2 mg. The sodium hydroxide must be accurately standardised (this means its concentration must be accurately determined) by titrating known mass of high-purity potassium hydrogen phthalate, and three such titrations give molar concentrations of 0.1167, 0.1163 and 0.1164 mol L-1. A volume of 36.78 mL of sodium hydroxide is used to titrate each sample. The standard deviation of the burette used is 0.02 mL. Calculate the percentage of acetic acid in the vinegar and its standard deviation.A concentrated sulfuric acid solution has a density of 1.84 g/cm^3 and contains 95.7% sulfuric acid by mass. (A) How many grams of pure sulfuric acid are contained in 1.00 gallon of this solution? (B) How many mm^3 of this solution contain 100.0 mg of pure sulfuric acid?If the density of a piece of oak wood is 0.850 g/cm^3, will the item float or sink in pure water?
- 1. In your pharmacy you have a balance with a sensitive requirement of 7mg; 10,25,50 and 100ml graduated cylinder; and 1 oz apothecary and 4-ounce apothecary conical cylinder. What is the minimum measurable volume in ml using the graduated cylinder?a. 5b. 20c. 1d. 2The molar volumes of pure acetone and pure chloroform at room temperature are 72.0 cm^3 and 81.0 cm^3, respectively. The volume of a liquid mixture containing 0.6 moles of acetone and 0.5 moles of chloroform isIron has a density of 7.874 g/cm^3.What is the mass of a rectangular block of iron with dimensions of 3.000 cm by 5.000cm?
- 9.81m/s^2 to ft/s^2Dimensional Analysis is a way of doing numerical "book-keeping" when converting quantities or performing calculations. • When converting quantities from one unit to another, conversion factors are used. Solving with Dimensional Analysis and Multiple Units: If I am in Canada where the price of gas is $1.022 USD·L1, how much will it cost me to fill up my gas tank if I travelled 125 km? • Let's also assume that my car gets an average of 30.0 miles/gallon.Convert the density of the unknown solid from g/ml to the SI units of Kg/m^3
- You have a stock solution certified by a manufacturer to contain 245.0±0.2 ?g SO2−4/mL. You would like to dilute it by a factor of 100 to obtain 2.450 ?g/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware Tolerance 1‑mL transfer pipet ±0.006 mL±0.006 mL 10‑mL transfer pipet ±0.02 mL±0.02 mL 100‑mL volumetric flask ±0.08 mL±0.08 mL Method A: Dilute 10.00 mL up to 100mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL. absolute uncertainty: ±.-----?g/mL Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask. absolute uncertainty: ±------?g/mLThe units of ku are mL (g−1·h−1) but the unit of ke is hour−1. Why?the concentration of carbon monoxide in an urban apartment is 48.0 ug/m^3. what mass of carbon monoxide in grams is present in a room measuring 9.0ft*14.5ft*18.8ft