Home > categories > Minerals & Metallurgy > Aluminum Foils > PLEASE HELP! I DO NOT GET THIS AT ALL!?
Question:

PLEASE HELP! I DO NOT GET THIS AT ALL!?

A sample of metal shavings with a mass of 0.0250 g contains a mixture ofaluminum and magnesium, though it is not known how much of each metal is present.To determine the composition of the mixture, the metal sample is reacted completelywith hydrochloric acidThe hydrogen gas produced is collected over water on a daywhen the temperature is 23.0 oC and the atmospheric pressure is 755.0 TorrAfter thereaction, the water level in the collection tube was 25.5 cm higher than the water level inthe beakerThe volume of gas collected under these conditions was measured at 30.48mL.aIs the pressure of the gas inside the collection tube higher than or lower than theatmospheric pressure? ExplainWhat is the pressure of the gas inside the gascollection tube?bWhat is the partial pressure of just the hydrogen gas?cHow many total moles of hydrogen gas are produced?dDetermine the mass of each metal present in the original sample.

Answer:

I think it's because beer and sodas are acid, and can't be well conserved in tin cans for long periodsCanmakers probably don't use alu for all cans, cause it would be too expensive
ait is lowerthe gas pressure in the tube p2 plus the pressure of 25.5cm of water p1 is balanced by the atmospheric pressure p0, because pressure in a fluid like water is the same at points on the same horizontal levelp2+p1p0water pressure p1 density x g x height 1000 kg/m^3 x 9.8 m/s^2 x 0.255 m 2499 N/m^2.
I would think it is because of insolationBut I don't knowTin probably isn't as valuable, and isn't worth while to recycleWhile aluminum is.
beer and coke require a metal capable of withstanding corrosives(both alcohol(beer) and hydrochloric acid(coke) are present), yet maintaining a perfect air-tight seal to retain the fizzcanned foods do not require these featureseither that or the FDA has some odd regulationsthey're known to pull that kinda

Share to: