Lorenzo

estimate the ΔHrxn (in kJ) for the combustion of 1 mole of gaseous C2H4. Assume that all products are gaseous

Balance the following redox reaction if it occurs in acidic solution.  What are the coefficients in front of  H2C2O4 and H2O in the balanced reaction?Note the "-1" charge on the first reactant: MnO4⁻ (aq).

            MnO4⁻ (aq) + H2C2O4(aq)  →  Mn2+(aq) + CO2(g)

Consider the following thermochemical equation:

2NH3(g) + 6H2O(g) ----> 1/2 N2(g) + 9H2 + (5/2)O2(g) + NO(g) ΔHrxn^(0) =?

What is the ΔHrxn (in kcal) given the following thermochemical data?

N2(g) + O2(g) -----> 2NO(g) ΔH (degrees) = 43.20 kcal

N2(g) + 3H2(g) ------> 2NH3(g) ΔH (degrees) = -22.10 kcal

2H2(g) + O2(g) -------> 2H2O(g) ΔH(degrees) =-155.60 kcal

The balanced net-ionic equation for the reaction between chromate and sulfite ion is given below. What volume (in L) of 0.487 M Li2SO3 solution is required to react completely with 35.0 mL of 0.555 M Na2CrO4?

2CrO4^(2-)(aq) + 1OH^(+)(aq) + 3SO3^(2-)(aq) ----> 3SO4^(2-)(aq) + 2Cr^(3+)(aq) + 5H2O(l) 

whatis the frequency (in Hz) associated with the Balmer Line where n-hi=5

Lyman=1

Balmer=2

paschen=3

fifty (50.0) mL of .400 M AgNO3 and 50.0 mL of .700 M HCI are mixed in a coffee cup calorimeter resulting to a mas of solution equal to 103g. If the two solution are initially at 26.35°C and the final T is 21.30°C. Assume that the specific heat of solution to that of water (4.18 J/g°C). what is the theoretical yield (mol AgCL) & what is the q reaction in kJ/mol AgCl?

It takes 56.7 seconds for 0.0469 moles of N2 gas to effuse through a pinhole. Under the same conditions, it takes 124 seconds for the same amount of an unknown gas to effuse. What is the molar mass (g/mol) of the unknown gas?

A 20.0L cylinder that has a movable piston is filled with gas X at a pressure of 0.966 atm at 45.0°C. if the piston is pulled up (expansion) so that the new volume is 36.7L and the new pressure is 0.555 atm, what is the new temperature (in K) assuming constant amout of gas X?

What mass (in grams) of C3H8 is required to fill an 29.0L container at a pressure of 121 psi at 32.0 °C?

what is the coefficient of H+ in the balanced equation below after balancing it in acidic medium using the smallest possible whole number coefficients? and which is the reducing agent?

PbO2(s) + Co(s)-->Co^3+(aq)