18 an important environmental consideration is the appropriate disposal of cleaning solvents. an environmental waste treatment company analysed a cleaning solvent, j, and found it to contain the elements carbon, hydrogen, and chlorine only. the chemical composition of j was determined using different analytical chemistry techniques. combustion reaction: combustion of 1.30 g of j gave 0.872 g co2 and 0.089 g h2o. precipitation reaction with agno3(aq): 0.535 g of j gave 1.75 g agcl precipitate. (a) determine the percentage by mass of carbon and hydrogen in j, using the combustion data. (3) (b) determine the percentage by mass of chlorine in j, using the precipitation data. (1) (c) the molar mass was determined to be 131.38 g molâ1. deduce the molecular formula of j.
Answers: 3
Chemistry, 21.06.2019 23:00
A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?
Answers: 1
Chemistry, 22.06.2019 05:30
Describe the interaction that occurs between two objects with the same electrical charge.
Answers: 1
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) â h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 20:30
Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.
Answers: 1
18 an important environmental consideration is the appropriate disposal of cleaning solvents. an env...
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