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December 13, 2013

# Posts by Chemistry

Total # Posts: 180

ChemChem

Chemistry Octane Combustion
Write the balanced equation for the combustion of octane (C8H18). Assuming that gasoline is 100% octane, with a density of 0.692 g/mL, what mass of CO2 is produced by combustion of 1.7 1010 gal of gasoline? Need help on how to get started, I have the balanced equation...

Chemistry
Got it now, thanks a ton.

Chemistry
Please elaborate on step 3. The balanced chemical equation is: Fe2O3(s) + 2 Al(s) -> 2 Fe(l) + Al2O3(s) After step 2 I have .32 moles Fe.

Chemistry
Fe2O3(s) + 2 Al(s) 2 Fe(l) + Al2O3(s) Suppose we want to make 18.0 grams of iron. We must figure out how much starting material we need. This is a three-step calculation. Let's go through these steps one-by-one to calculate the mass of Fe2O3 that we must start with. Expla...

Chemistry
Vitamin B12, cyanocobalamin, is essential for human nutrition. It is concentrated in animal tissue but not in higher plants. Although nutritional requirements for the vitamin are quite low, people who abstain completely from animal products may develop a deficiency anemia. Cya...

Sara
okie thank you =)

Sara
Neither Ka nor Pka was given

Sara
how did you calculate pKa because this is a practise question for my test and we won't be given the value. so how would you calculate it?

Sara
I'm making a mistake in using that equation: n (CH3COO-)= .0132*.2 = .oo264 ..does that mean that CH3COOH also has the same n? ph= pKa +log(Conjugate Base/ Weak Acid) 4.2= pKa + log (.00264/ .00264) since i have n the same it doesn't work. How do you calculate n?

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