4) An unknown compound, "X", is known to be either Srch or SrBrz. A 12.0 g...
3) Convert 0.200 g of sodium carbonate and 0.200 g of sodium bicarbonate to moles. Molar Mass of sodium carbonate 106.0 g/mol Molar Mass of sodium bicarbonate 84,0 g/mol 4) An unknown compound, "X", is known to be either SrCl2 or SrBr2. A 12.0 g sample of this compound yields 4.25 g of strontium. Identify the sample. Show the work. 5) How many milliliters of hydrochloric acid are required to react with 0.20 g of sodium carbonate? You must show...
Outline a procedure you would follow to identify either an unknown compound OR an unknown acid OR unknown base. Be sure to follow the scientific method in your work.
A 1.450 g sample of an unknown organic compound , X, is dissolved in 15.0 g of toluene ( C7H8 = 92 g/mol) and the freezing point is lowered by 1.33 oC. What is the molecular weight of the organic compound? (Kf = 5.12 oC/m).
A 12.5855 g sample of an unknown compound (X) is dissolved in 32.0000 g of water. The resulting solution has a freezing point of – 4.3oC. What is the molar mass of X? Kf = 1.858 oC/m.
An aqueous solution containing 16.2 g of an unknown molecular (nonelectrolyte) compound in 109.5 g of water was found to have a freezing point of -1.8 ∘C. Calculate the molar mass of the unknown compound. Please show all work.
An unknown metal has a mass of 74.1 g. When 1.90 x 103 J of heat are added to the sample, the sample temperature changes by 34.1 °C. Calculate the specific heat of the unknown metal. Metal potassium Specific heat (J/g °C) 0.750 0.385 0.301 copper strontium barium calcium nickel specific heat: J/(g. °C) 0.204 0.650 0.440 What is the possible identity of the metal based on the calculated specific heat? O potassium O strontium nickel copper
4) A sample of 0.870 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated with an excess of Na2SO4. If the mass of the BaSO4 precipitate formed is 0.4105 g, what is the percent by mass of Ba in the original compound?
You have isolated an unknown colored compound (MW = 200,000 g/mol) with a concentration of 5 mg/mL. After you add 2 mL of your unknown to 8 mL of buffer, you obtain an absorption spectrum of your colored compound. You record an Absorbance value of 0.57 at its lambda max, 460 nm. The light path is 1 cm. Calculate the molar concentration (M) of your diluted sample. Show your work. B. Calculate the extinction coefficient (M-1cm-1) of your diluted...
You have isolated an unknown colored compound (MW = 200,000 g/mol) with a concentration of 5 mg/mL. After you add 2 mL of your unknown to 8 mL of buffer, you obtain an absorption spectrum of your colored compound. You record an Absorbance value of 0.57 at its lambda max, 460 nm. The light path is 1 cm. Calculate the molar concentration (M) of your diluted sample. Show your work. B. Calculate the extinction coefficient (M-1cm-1) of your diluted...
QUESTION 1 A student was given a bottle containing an unknown compound known to be an alcohol, an alkane, an alkene, or an aromatic The student tested the compound with Br2, and found that the brown bromine drops very quickly turned clear. The student then tested the compound with a solution of KMnO in water and found that the purple color quickly turned to a dark brown color Ignition of a small sample burned with a luminous yellow flame and...