- Desity?...Physics?

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If 29.5 grams of hydrogen peroxide (H2O2) react to form 15.6 grams of water, how many grams of oxygen must simultaneously be formed? The number of possible rational roots of the polynomial f(x) = 6x^4 + 2x^3 - x^2 + 2 is...? Are black holes essentially gobbling up the universe which would nullify the theory that the universe is expanding? If I am to major in chemistry from states. As a freshman, what courses do i have to take? It's possible to break the 4th dimension? The time?