Science & Mathematics - 4 September 2006

How many grams of O2 are required to burn 5.15 gal. of C8H18?

The complete combustion of octane, C8H18, a component of gasoline, proceeds as is shown below.

2 C8H18(l) + 25 O2(g) 16 CO2(g) + 18 H2O(l)

(a) Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 5.15 gal. of C8H18?

2006-09-04 23:59:42 · 4 answers · asked by cheezzznitz 5 in Chemistry

i know roulette gives really good odds but what other games give similar or better odds?

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Find each of the two areas bounded by y=x^3-4x and y=x^2+2x ?
please help me with dis.....i dont know if may answer is correct

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can you say no?

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to give you a clue the answer is above the waist

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a. (4,-3)
b. (-3,2)
c.(-2,-3)
d. (2,-3)

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1.2 x 10^4 atoms of Si to grams?

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It's often said (particularly by those peddling mind excercises etc.) that we only use 50% or 60% (or x %) of our brain capacity - but how can this be true? Evolution would not have given us excess capacity - particularly of an organ that is so expensive in terms of energy. I can understand a little bit of redundancy, but not that much unused capacity.

2006-09-04 23:03:18 · 16 answers · asked by Bazil A 1 in Biology

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i know there is an easy formula but i have forgotten it since school! i want to find out the percentage of 41 out of 300.

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