I have a question about gibbs free energy vs gibbs standard free energy.

We know that at equilibrium deltaG = 0 and Q = K, and deltaG standard is a non-zero value.
But I don't understand. If I want to see if a reaction is at equilibrium then I have to calculate the deltaG standard first, before I can calculate deltaG to see if its value is 0 or not.

And everytime I do that, the deltaG standard equals 0 under standard conditions. That dosen't makes sense comparing to the statement about that deltaG standard is a non-zero value at equilibrium.

Why is my deltaG standard always zero? The relationship between them will be: deltaG=deltaG standard at equilibrium????

Help me

It’s stated that a H2 molecule is glued together by a pair of electrons. Now you have read about molecular orbitals in homonuclear diatomic molecules. What is chemical bonding? Why are molecules hold together? (Please use general concept, without resorting to too much math.)(The answer should be no more than 800 words.)

Explain the advantages and disadvantages of open tubular vs packed columns. Why aren’t packed columns use with HPLC?

what are the three types of injections with GC and when they should be used. Explain why cold trapping and solvent trapping are used and what they are.

A 100.0 −mL buffer solution is 0.105 M in NH3 and 0.135 M in NH4Br.

A. What mass of HCl could this buffer neutralize before the pH fell below 9.00

B. If the same volume of the buffer were 0.265 M in NH3 and 0.390 M in NH4Br, what mass of HCl could be handled before the pH fell below 9.00?

I know for A i have tried .19g, .0915, and .5`3 using three different methods. I have no idea what to do now.

Aqueous hydrobromic acid HBr reacts with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O. If 0.0735g of water is produced from the reaction of 1.6g of hydrobromic acid and 0.51g of sodium hydroxide, calculate the percent yield of water. Be sure your answer has the correct number of significant digits in it.

1)how many moles of Al are in 1mole of KAI(SO4)2 ---->12H20?

2)what is the molar mass of potassium aluminum sulfate dodecahydrate?

3)if you have 1.20g of Al, how many grams of potassium aluminum sulfate dodecahydrate should you expect to produce if you have no other limiting reactants?

4)using your data from question #4 if you actually produce 6.6g of potassium aluminum sulfate dodecahydrate what is your percentage yield?

5)based on your results from question #4 if your percentage yield was 112% what mass of potassium aluminum sulfate dodecahydrate would you recover?

The boiling point constant for water is 0.51 Kkg/mol. Calculate boiling point of water in a solution gf 0.010 mol/kg of sugar and a solution of 0.010 mol/kg of NaCl.

For the following reaction, 24.5 grams of diphosphorus pentoxide are allowed to react with 13.3 grams of water.

diphosphorus pentoxide (s) + water (l) -> phosphoric acid (aq)

what is the maximum mass of phosphoric acid that can be formed? _____ grams

what is the formula for the limiting reagent? ________________

what mass of the excess reagent remains after the reaction is complete? _______ grams

A mixture of hydrocarbons (10mol% methane, 20 mol% ethane, 30mol% propane, 15mol% isobutane, 20 mol% n-butane, 5 mol% n-pentane) is flashed into a separator at 80 F and 150 psia. What fraction leaves the separator as liquid and what is its composition?

A mixture of 1.397 g of H2 and 70.76 g of Br2 is heated in a 2.00 L vessel at 700. K. These substances react according to H2(g) + Br2(g) ↔ 2 HBr(g). At equilibrium the vessel is found to contain 0.592 g of H2. (a) Calculate the equilibrium concentrations of H2, Br2, and HBr. (b) Calculate Kc.

What is the Lock signal? What nuclei generate the Lock signal?

Which UV light hits earth's surface at the greatest intensity?

Use Charles's law to complete the table. (Assume pressure and number of moles of gas to be constant.)

A&B Express the volume in liters to three significant figures.

C&D Express the temperature in degrees Celsius to three significant figures.

In acidic solution, the sulfate ion can be used to react with a number of metal ions. One such reaction is

SO42−(aq)+Sn2+(aq)→H2SO3(aq)+Sn4+(aq)

Since this reaction takes place in acidic solution, H2O(l) and H+(aq) will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation:

SO42−(aq)+Sn2+(aq)+     −−−→H2SO3(aq)+Sn4+(aq)+     −−−

What are the coefficients of the reactants and products in the balanced equation above? Remember to include H2O(l) and H+(aq) in the appropriate blanks. Your answer should have six terms.

Enter the equation coefficients in order separated by commas (e.g., 2,2,1,4,4,3). Include coefficients of 1, as required, for grading purposes.