Propane burns completely in oxygen as shown. C3H3(g) + 502(g) --> 3C02(g) + 4H2O(l)
100 cm^3 of propane was mixed with 600 cm^3 of oxygen and the mixture was ignited.
What is the total volume, in cm^3, of the gas mixture at the end of the reaction?
All gas volumes were measured at room temperature and pressure.
A 300
B 400
C 700
D 800

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.