The colorless gas phosphorus trifluoride reacts slowly with water to give a mixture of phosphorus acid and hydrofluoric acid . (a) Write a balanced chemical equation for this reaction. + + (b) Determine the concentration (in moles per liter) of each of the acids that result from the complete reaction of 5.71×10-2 moles of phosphorus trifluoride with enough water to give a solution volume of 711 mL. phosphorus acid : M hydrofluoric acid : M

13. calculate the initial concentration (before precipitation) of carbonate ions after the addition of each 0.05 ml of solution b to the 1.00 l beaker of solution a. divide the work among group members and write the answers in the table in model 3. assume the volume change as solution b is added is negligible. 14. notice the initial concentrations of zn2+ - and cu2+ in the table in model 3. a. explain how these were obtained from the data in model 2. b. as solution b is added and precipitates form, do these initial concentrations change? 15. use the data in model 2 to indicate the presence of precipitate (either znco3 or cuco3) after each 0.05 ml addition of solution b in model 3. 16. use the initial concentrations of carbonate ions and zinc ions to calculate the reaction quotient, qsp for the zinc carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3. 17. use the initial concentrations of carbonate ion and copper(ii) ions to calculate the qsp for the copper(ii) carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3.

Identify the electromagnets with poles that are reversed from the electromagnet shown above

What is the molar mass of the anhydrous compound? answer using four significant figures. 36.02 g/mol 120.15 g/mol 156.12 g/mol