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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 Jwas determined using different analytical chemistry techniques.

Combustion reaction:
Combustion of 1.30 g of J gave 0.872 g CO2and 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. (b) Determine the percentage by mass of chlorine in J, using the precipitation data.
(c) The molar mass was determined to be 131.38 g mol–1. Deduce the molecular formula of J.
What is the number of half filled orbital in an atom of Zn?
The recombination of iodine atoms in the gas phase in the presence of argon was investigated and the order of the reaction was determined by the method of initial rates. The initial rates of reaction of 2 1 (g) + Ar(g) → 12(g) + Ar(g) were as follows: [lo/(10-5 mol dm3) 1.0 l'o/(mol dm"3 S-1) (a) 8.70 × 10-4 3.48 × 10-3 1.39 × 10-2 3.13×10-2 2.0 4.0 6.0 (b) 4.35 × 10-3 (c) 8.69 × 10-3 1.74× 10-2 3.47 × 10-2 6.96x10-2 1.38 × 10-1 1.57x10" 3.13×10-1 The Ar concentrations are (a) 1.0 mmol dm-3, (b) 5.0 mmol dm-3, and (c) 10.0 mmol dm-3. Determine the orders of reaction with respect to the I and Ar atom concentrations and the rate constant.
How many grams of sodium are needed to produce 3.90 moles of sodium oxide
____Na + ____O2 —-> ____Na2O

(both 2 are supposed to be smaller)
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 7.00 moles of aluminum sulfate, Al2(SO4)3
The recombination of iodine atoms in the gas phase in the presence of argon was investigated and the order of the reaction was determined by the method of initial rates. The initial rates of reaction of 2 1 (g) + Ar(g) → 12(g) + Ar(g) were as follows: [lo/(10-5 mol dm3) 1.0 l'o/(mol dm"3 S-1) (a) 8.70 × 10-4 3.48 × 10-3 1.39 × 10-2 3.13×10-2 2.0 4.0 6.0 (b) 4.35 × 10-3 (c) 8.69 × 10-3 1.74× 10-2 3.47 × 10-2 6.96x10-2 1.38 × 10-1 1.57x10" 3.13×10-1 The Ar concentrations are (a) 1.0 mmol dm-3, (b) 5.0 mmol dm-3, and (c) 10.0 mmol dm-3. Determine the orders of reaction with respect to the I and Ar atom concentrations and the rate constant.
How many moles of F2 are needed to produce 3.8 moles of NaF
What is the percentage of chlorine in sodium chloride
A chemist prepares a sample of hydrogen bromide and finds that it occupies 267 mL at
70◦C and 531 Torr. What volume would it
occupy at 0◦C at the same pressure?
Answer in units of mL.
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