1 - Determine the number of moles of water needed to produce 250 gH2SO3 2 - Determine the number of moles of P4O10 produced from 50.0 g of P.
3 - I need to produce 2000. kg of Fe2O3. How many moles of oxygen do I need to react?
4 - Determine the mass of phosphorus necessary to produce 85 kg ofP4O10.
5 - Determine the mass of sulfur dioxide needed to produce 125 gH2SO3.
6 - Determine the mass of sulfur dioxide produced from 125 g of iron (II)sulfide

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

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.

Read "who built the pyramids? ”. leave this link open while you answer the questions throughout the assignment. give at least two reasons why some people claim the pyramids of giza were constructed by aliens.