November 28, 2015

Homework Help: chem 3A

Posted by shylo on Friday, July 25, 2008 at 8:40pm.

please help me with these homework problems from chemistry because the teacher did not give enough information to some of these chemistry work problems.

1) 50.0 g of aluminum is reacted with excess sulfuric acid. The chemical equation for the reaction is:
2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
If 58.7 L of H2 are collected over water at 20 degree C and 785 torr, what is the mass percent yield?
(Vapor pressure of water at 20 degree C is 17.5 torr.)

2) What is the density of hydrogen, in g/L, under lab conditions? Under STP conditions?

3) Carbon monoxide can be reacted with hydrogen to produce methanol. The chemical equation for the reactions is:
CO(g) + 2H2 --> CH3OH(g)
If 52.10 L of hydrogen gas at STP is completely reacted with excess carbon monoxide gas,what volume in liters of methanol st STP will be produced?

4) The 4.25 grams of sugar (C6H12O6) reacts with sufficient oxygen to produce 3340 mL of carbon dioxide collected over water at 751.9 mm Hg at 24 degree C. Vapor pressure of water at 24 degree C is 22.4 mm Hg. What is the percent yield?

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