How many moles of NH3 would be needed to produce 1.99 x 1025 molecules of H20? Assume the reaction is 100% efficient and that oxygen gas is present in excess. A. 49.6 moles
B. 8.93 moles
C. 3.97 moles
D. 22.0 moles

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Sugar is dissolved in water. which is the solute? sugar neither both water

Nonpoint source pollution is difficult to control because it

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.