Friday
May 24, 2013

# Posts by lena

Total # Posts: 970

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.57 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of h...

Chemistry
2 and 4

chemistry
Methane (CH4) burns in oxygen to produce carbon dioxide and water vapor. The balanced equation is: CH4 + 2 O2 -> CO2 + 2 H2O What volume of carbon dioxide is produced when 3.2 L of oxygen are consumed?

chemisy
Methane (CH4) burns in oxygen to produce carbon dioxide and water vapor. The balanced equation is: CH4 + 2 O2 -> CO2 + 2 H2O What volume of carbon dioxide is produced when 3.2 L of oxygen are consumed?

Determination of ASA Content of Tablets Lab Report
Not asking for answers necesarily but I would to know how to approach each question Mass of pure acetylsalicylic acid (ASA) : .508 g Dilution Absorbance (a.u.) 2:11 .116 4:11 .259 6:11 .392 8:11 .502 10:11 .548 Mass of tablet : .380 g Absorbance read on the Spec 20 : .314 a.u...

Math
John's Collection: 10 coins in all 2 fewer quarters than dimes 2 quarters Q = D = N =

Match
John's Collection: 10 coins in all 2 fewer quarters than dimes 2 quarters Q = D = N =

Chem
Thanks!

Chem
What pressure (atm) is needed to confine an ideal gas to 68.0 L after it has expanded from 44.0 L and 2.3 atm at constant temperature?

CHEM
Silicon carbide, commonly known as carborundum, is a very hard and abrasive substance. The compound is prepared by heating silicon dioxide in the presence of graphitic carbon: SiO2(s) + 2C(s) --> SiC(s) + CO2(g) How many grams of silicon carbide can be formed from 55.0 g of...

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