Wednesday
October 1, 2014

Posts by starlight


Total # Posts: 9

precalculus
Using data from past years, the economists for smith brothers inc determined that the revenue f the company can be modeled by the function R(x)=0.0125x^2+412x. In addition, the function C(x)=12225+0.00135x^2 models the total cost of doing business, where x us v the number of ...
April 10, 2013

chemistry
last check: (c) A wine cooler contains 4.5% ethanol by mass. Assuming that only the alcohol burns in oxygen, how many grams of wine cooler need to be burned to produce 3.12 L of CO2 (d = 1.80 g/L at 25°C, 1 atm pressure) at the conditions given the density? 1 C2H5OH + 3 O2...
October 12, 2008

chemistry
(You may have seen this before) A crude oil burned in electrical generating plants contains about 1.2% sulfur by mass. When the oil burns, the sulfur forms sulfur dioxide gas: S(s) + O2(g) -------> SO2(g) How many liters of SO2 (d = 2.60 g/L) are produced when 1.00 x 104 kg...
October 11, 2008

chemistry
i got 92.3 L SO2 is this correct?
October 10, 2008

chemistry
A crude oil burned in electrical generating plants contains about 1.2% sulfur by mass. When the oil burns, the sulfur forms sulfur dioxide gas: S(s) + O2(g) -------> SO2(g) How many liters of SO2 (d = 2.60 g/L) are produced when 1.00 x 10^4 kg of oil burns at the same ...
October 10, 2008

chemistry
for (b) this is my work1250 g of H2O * 1 mol / 18 g = 69.44 mol of H2O # of moles of C2H5OH = 69.44 mol of H2O * 1 mol of C2H5OH / 3 mol of H2O = 23.15 mol of C2H5OH * 46 g / 1 mol = 1065 g of C2H5OH 1065 g of C2H5OH * 1 cm3 / 0.789 g = 1350 cm3 of C2H5OH = 1350 mL of C2H5OH...
October 10, 2008

chemistry
its okay its np =)
October 10, 2008

chemistry
I also don't completely understand this line: 1.25 L H2O has a mass of 1.00 gram. I thought since the density was 1g /cm^3 it would be more like 1g / mL = 1000g/ L so 1250 g of H2O?
October 10, 2008

chemistry
for the balanced equation i got 1C2H5OH + 3O2 ==> 2CO2 + 3H2O - why is this wrong?
October 10, 2008

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