Thursday
December 5, 2013

# Posts by greeny

Total # Posts: 45

chem
Thanks!

chem
the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound? ------------------------------------------ 4.88 g CO2 x 1 mol CO2/44.01 g CO2 x 2 mol O2= .2217 mol O2 1.3...

math
how many different positive four-digit integers can be formed if the first digit must be 2, the last digit cannot be zero, and digits may be repeated? I know the answer is 900 but I'm not sure how I would get the answer? thanks!

chem
Aspirin, C9H8O4, is produced from salicylic acid, C7H6O3, and acetic anhydride, C4H6O3: C7H6O3 + C4H6O3 --> C9H8O4 + HC2H3O2 a. How much salicylic acid is required to produce 1.5 x 10^2 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? b. how m...

math- finding zeros
oh yeah, I forgot about the conjugates! thanks! One more question, how do i divide x^4-2x^3-x^2+6x-6 by x^2-2x+2 using synthetic division?

math- finding zeros
Using the given zero, find all the zeroes and write a linear factorization of f(x) 1 + i is a zero of f(x)= x4-2x^3-x^2 + 6x -6 I did synthetic division and I got that it wasnt a zero?

chem
im a bit confused on how and why surface tension and viscosity decrease with increasing temperature?

US History
Did people in Virginia convert Native Americans to Christianity?

chem
for solutions of a weak acid, a graph of pH versus the logarithm of the initial acid concentration should be a straight line. What is the magnitude of the slope of that line?

chem
If a neutral solution of water, with pH = 7.00, is heated to 50 deg C , the pH drops to 6.63. Does this mean that the concentration of [H+] is greater than the concentration [OH-]of ?

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