It takes 25 mL of 0.75 M NaOH solution to completely neutralize 155 mL of a sulfuric acid solution (H2SO$). What is the concentration of the H2SO4 solution? (There is 2 acids to 1 base)
Don't forget significant figures, do not write a unit.

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.