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You are asked to identify an unknown liquid that is known to be one of the liquids listed below. You pipet a 3.50-mL sample into a beaker. The empty beaker had a mass of 12.20 g, and the beaker plus the liquid weighed 16.08 g.
Substance Density at 25 °C (g/cm3)
Ethylene glycol 1.1088 (major component of automobile antifreeze)
Water 0.9971
Ethanol 0.7893 (alcohol in alcoholic beverages)
Acetic acid 1.0492 (active component of vinegar)
Glycerol 1.2613 (solvent used in home care products)
(a) Calculate the density and identify the unknown.
(b) If you were able to measure the volume to only two significant figures (that is, 3.5 mL, not 3.50 mL), will the results be sufficiently accurate to identify the unknown? Explain.
The pressure in an oxygen tank stored at 0°C is 10.0 atm. What pressure will develop in the tank if it is heated in a fire to 500°C?
The total concentration of dissolved carbonates in the lake is 0.0045 M. Find out the molar concentration of carbonate (CO3-2) in the lake if Ka1= 4.3x10-7 and Ka2 = 5.6x10-11.
Tooth enamel is mainly hydroxyapatite. If 1.150g of tooth enamel reacts with hydrochloric acid to give 1.231g of calcium chloride, what is the percentage of hydroxyapatite in the tooth enamel sample
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use any resources available to you to find the structures of these drugs and then identify the functional group or
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What mass of hydrogen chloride gas is required to produce 250ml of a hydrochloric acid solution with a pH of 1.57
A compound is composed of elements C, H, and N. A 11.550-mg sample of the unknown compound was combusted, producing 31.332 mg of CO2 and 8.983 mg of H2O. What is the empirical formula for this compound
Specify the number of possible isomers of Trinitrophenol. Abbreviate ortho (o), meta (m) and para (p).
Bromine can be obtained from the decomposition of calcium bromide by means of electrolysis. If 10.0 g of calcium bromide are dissolved in water
1) Bakelite us obtained by the condensation of : 2) When HCHO reacts with Nh3, the compound formed is :
If a student weighed a copper wire that was significantly larger than the size recommended in the procedure.
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