- Why time travel isn't possible?

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Calculate the mass of CO2 produced when 1.00 mole of propane (C3H8) is burned in excess of oxygen.? Given vectors a=[2,-1.5] determine two vectors b and c so that a, b and c are mutually perpendicular? How to write 0.3864 with 3 significant figures? Please explain I'm a little confused!? Why is the Mitochondria the power house of the cell? Calculate the power expended when a 500 N barbell is lifted 2.2 m in 2.0 s?