Recent content by chemistry4all

Homework Statement When do you use 1 mol = 22.4 L and 1 mol = 24 L? I have a test coming up and would like to clarify this. Homework Equations The Attempt at a Solution I know that 1 mol = 22.4 L of any ideal gas at STP mean 1atm at (273K) I understand this. But what about...

How to count molecules and determine density, partial pressure and total pressure? Homework Statement Consider three identical boxes each containing a different mixture of O2 and N2. In box #1 are 3 molecules of O2 and 7 molecules of N2. In box #2 are 1 molecule of O2 and 2 molecules of...

oops didnt finish the last sentence. It is "What do you think you think the molecular formula of the gas is? I think its CH4 because that's the only molecule I can find that has a MM close to 16g.

Calculate the molar mass of a gas that has a density of 0.6536 g/L at 37C and 787 torr. What do you think the? My attempt: I used n= PV/RT and calculated the number of moles to be 16.0548g/mol. The second part is where I am confused. Anyone help?

Calorimeter questions? Homework Statement I need help with answering some questions A. Why do the temp of HCl and NaOH have to be essentially equal before mixing them? B. Why is it necessary to measure the volumes of the liquids as accurately as possible? Homework Equations...

Homework Statement Enthalpies of Formation. burning methane in oxygen can produce three different carbon-containing products: soot (very fine particles of graphite), CO2 (g), and CO2 (g). A) Write three balanced equations for the reaction of methane gas with oxygen to produce these three...

I know this is wrong because the first equation if you look at the standard formation of enthalpies chart is correct and so is the number for O2 ----> O3 is correct with the proper coeffients that are already in front of it. So mathematically the equation A and B should add up be able to get...

the -241 is from the data table of standard formations of enthalpy but in this problem it does not want me look it up it wants me to calculate it using the two equations. The answer should be double the -241 but its not coming out that way. I think I did something wrong and I have tried...

Homework Statement From the enthalpies of reaction for equations A) and B), calculate the heat of reaction for equation C). A) 2H2 (g) + O2 (g) ----> 2H2O2 (g) DH= -483.6 kJ B) 3O2 (g) ----> 2O3 (g) DH= +284.6 kJ...

I understand the formula and how its used but I don't know how to still get the magnitutde and determine the right answers. I am not understanding something. I have been on this damn one question for 6 hrs I am done I give up. Thanks for everyones help.

okay chrages are measured in C which is coloumbs now i have the correct units. The charges are not -1 and +1 they are proton=(1.6x10^-19) electron=(-1.6x10^-19) R which is d was 3/2 k=8.99x10^9 so I used the same formula Eel=kQ1Q2/(3/2) Eel=(8.99x10^9 J-m/c^2)(1.6x10-19...

Here is what I have found from my textbook and was not sure exactly how to use it. The formula for electrostatic potential energy is Eel=kQ1Q2/d Eel = total electrostatic energy k= 8.99x10^9 J-m/c^2 Q1= would be charge of +1 Q2= would be charge of -1 Then I plugged it all...

Homework Statement Two oppositely charged balls are hung by strings from a wooden dowel. The two balls are separated by a distance of R. a) If the balls are moved along the dowel until their separation is 3/2 R, has their potential energy increased or decreased? b) What is the...