Consider the combustion of 1 kmol of propane with air at 1 atm. construct a single graph using h-t coordinates that shows the following: a. reactants' enthalpy, h, in kj versus temperature, over the range of 298–800 k for o = 1.0. b. repeat part a for =0.75. repeat part a for q = 1.25. d. products' enthalpy, h, for ideal combustion (no dissociation) versus temperature, over the range of 298–3500 k for 0 = 1.0. e. repeat part d for q = 0.75. f. repeat part d for ø = 1.25, using the water-gas equilibrium to ac- count for incomplete combustion.

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

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.