Wednesday
June 19, 2013

# Posts by -

Total # Posts: 58

chem- easy
What is the total mass of a solution prepared by dissolving 4.00 of in 1.00 of water?

CHEM-vaporization
A 50.0g piece of iron an 152°C is dropped into 20.0g H2O(l) at 89°C in an open, thermally insulated container. How much water would you expect to vaporize, assuming no water splashes out? The specific heats of iron and water are 0.45 and 4.21 respectively, and ÄHv...

CHEMISTRY!
I did it again this time I got 7774.51g which is much better. Thanks alot!

CHEMISTRY!
I feel like I have made a mistake because the mass seems too small. I don't know where I went wrong :S Molality = ÄTf / (Kf * i) = 23.3°C / (1.86°C/m * 3) = 4.18m (mol C2H6O2 / kg water) The amount to dissolve is: n_C2H6O2 = molality * m_water = 4.18 mol/kg * ...

CHEMISTRY!
I feel like I have made a mistake because the mass seems too small. I don't know where I went wrong :S Molality = ÄTf / (Kf * i) = 23.3°C / (1.86°C/m * 3) = 4.18m (mol C2H6O2 / kg water) The amount to dissolve is: n_C2H6O2 = molality * m_water = 4.18 mol/kg * ...

CHEMISTRY!
what mass of ethylene glycol C2H6O2 the main component of anitfreeze, must be added to 10.0L water to produce a solution for use in a car's radiator that freezes at -23.3°C. Assume the density for water is exactly 1 g/m.L

find points on the curve x^2+xy+y^2=7 (a) where the tangen is parallel to the x-axis adn (b) wehre the tangent is parallel to athe y-axis. (in this case, dy/dx is not defined, but dx/dy is. what value does dx/dy have at these point?)

government
Advocates of a parliamentary system argue that congress is inefficient, moves slowly, and develops policies laced with compromises. What evidence exists to support this negative evaluation?