Now that you have determined the concentration of the base used to titrate the HCl in the micropipette, and you have recorded the volume of the HCl sample (5.00 mL) and the number of mL of base used, you can calculate the concentration of the HCl solution. Pop up the Data Sheet to get the number of mL of base used to titrate the HCl solution. First calculate the number of moles of base used (be careful about the volume units): moles base = (Vbase) (Mbase) Moles of base mol This is equal to the number of moles of HCl present in the 5.00 mL of HCL delivered to the flask.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.