General Chemistry Answers

find the mass percentage of methane (CH4)

For the reaction N2 ( 8 ) + 3H2 ( g ) + 2NH3 ( g ) , equilibrium pressures are Pvz = 2.6 atm , PH = 5.6 atm , and PxH : = 1.2 atm . Calculate the Gibb's free energy of the reaction at a temperature of 298K . ( A ) 1.43 kJ B ) 1.43x104 J C ) 1.41x103 J D ) 4.25 x10' J

Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for "Chinese restaurant syndrome," the symptoms of which are headaches and chest pains. MSG has the following composition by mass: 35.51% C, 4.77 % H, 37.85 % O, 8.29 % N, and 13.60% Na. What is its molecular formula if its molar mass is about 169 g?

12) Write the word and skeletal chemical equation for each reaction. [4 marks, C] Show states in the chemical equation. 

a) The COMPLETE combustion of butane (C4H10). 

Word: 

Chemical: 

b) The INCOMPLETE combustion of methanol (CH3OH). 

Word: 

Chemical:

Calculate the concentrations of H*, OH, NH and NH4* in a 0.300 M NH solution at a temperature of 25 °C. The K for NHy is 1.8x10-5

[Ht]=

[OH]

[NHA*] =

[NHa] =

Calculate the concentrations of H*, OH*, C2HgNHa and CzHgNHg* in a 0.00700 M C2HNH2 solution at a temperature of 25 °C. The K, for C2H5NH2 is 5.6x 10-4

[Ht] =

[OH-1=

[C2HsNHg *] =

[C2HsNH2]

Calculate the concentrations of H*, OH, CHyNH2 and CHgNHg+ in a 0.0100 M CHgNH2 solution at a temperature of 25 °C. The Kp for CHyNH2 is 4.4x10-4

[OH-] =

[CHaNHat] =

[CHeNH2] =

[H*1 =

The pH of a 0.160 M solution of a weak base is 9.21. What is the Kb of the base?

Suppose that spin quantum number could only have a -1/2,0, and +1/2 and assuming that the rules governing the values of the other quantum numbers and the order of filling sublevels were unchanged.What would be the electron configuration of the element with an atomic number of 17. give explanation

Calculate the grams of solute that must be dissolved in 250 kg of water in the preparation of a 13.0% sodium chloride solution

Calculate the percent by mass of the solution containing 8.60 g of tha salt in 95.0 g of solution.

valence electron are those in the highest energy level _ and _ orbitals only