Chemistry

Electrochemistry Lab Help

I have to do the following calculations and I dont know how to do them. This is the data: mass of copper anode before electrolysis= 23.0425g mass of copper anode after electrolysis= 22.9041g time of e

Consider the reaction represented by the (unbalanced) equation: NH3 + O2→NO + H2O

For every 1.00 mol of NH3 that reacts, how many mols of O2 is required?-4NH3 + 5 O2 --> 4 NO + 6 H2O Since we have 4mol NH3 /5mol O2, so with every 1.00mol NH3 will require 1.25 mol O2 Its like this:

NH3 (aq) + H2C2O2 (aq) = PLEASE HELP

please include the state of the compound if you know it.-NH4+ + HC2O2- (both are aqueous)

If the total volume of gas collected is 724 mL, what mass of hydrogen gas is collected

given: The hydrogen gas formed in a chemical reaction is collected over water at 30.0 deg C at a total pressure of 732 mm Hg. Part A:What is the partial pressure of the hydrogen gas collected in this

Cyclopropane mixed in the proper ratio with oxygen = anestetic. At 755 mm Hg and 25 C density = 1.71 g/L

a) What is the molar mass of cyclopropane? b) Cyclopropaneis made up of 85.7% C and 14.3% H. What is the molecular formula of cyclopropane?-Let us see, you need to use the ideal gas equation in a slig

OChem Lab: percent recovery/yield

Sorry, I am just really confused about how to obtain this from my experiment. The experiment consisted of extracting caffeine from tea. Basically amount of tea leaves: 2.5347g After steeping it, we

How to calculate pH please

What is the pH in the titration of 77 mL of 0.1 M HCl with 0.1 M NaOH after the addition of 62 mL 0.1 M NaOH.-pH = -log[H+] that is, pH = the negative base 10 logarithm of the concentration of hydroge

Balance the reaction below, but include coefficient for unknown species

Balance the reaction below; determine the sum of the coefficients; this is in a basic solution! Include co-efficients for any unshown species(such as water and hydroxide). CrO42- + _H2O2 « _Cr(OH)3 +

Need help with Chemistry, 10 pts

How would I find the theoretical density and percent errors of the unknown liquid and unknown solid, using this information? -Unknown liquid Graduated cylinder mass in grams: 44.52 Graduated cylinde

When 156 mL of water at 26C is mixed with 91 mL of water at 85C, what is the final temperature? (Assume that n

When 156 mL of water at 26C is mixed with 91 mL of water at 85C, what is the final temperature? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL)-How about you do some freakin

Endothermic/Exothermic (Please help)

Label each of the following reactions as exothermic or endothermic (exo or endo), and according to whether work is done on or by the system, or no work is done at all (on, by or none)? Note that no en

What is the oxidation number of C in CH2O2? CONFUSED!

and how did you get that answer??-C + 1*2 - 2*2= 0 C+2-4= 0 C-2 = 0 C = +2

How many ml of .048M naoh are required to reach the equivalence point in titrating 28 mL of .018M h2so4

i feel like it should be 10.5 but for some reason my answer key is telling me its 21. please help-Do you have a balanced equation? 2 NaOH+H2SO4------>Na2SO4+2 HOH (2 H2O) So you need 2 mole NaOH/Mole

Percentage composition by mass question

Okay so I have a question that I sort-of understand, but.. An ionic compound has the following percentage composition by mass: Iron, Fe = 29.7%, Carbon, C = 19.2%, Oxygen, O = 51.1% Also given, that

What is a current event that happened within the last 6 months that deals with chemistry

Nuclear power plant issues in Japan?