Chemistry Answers

For a certain first order reaction, half life is 100s, how long will it take to be 75% completed

Compound prepared in lab was found to be 3,4 di-bromo hexane write all the possible structures of it and specify them as R and S. Give stereochemical relationship between all the isomers. Can the isomers of the above compound be separated based upon physical properties? 

Calculate the volume of 0.400 M H3PO4 needed to react with 200.0 mL of 0.200 M NaOH.

If 0.650% solution of Na2CO3 will be used to precipitate Ca+² from solution, determine the amount of solution,in grams, needed to precipitate 5.00×10² mL of 0.01120M Ca+²?

Calculate the volume, in mL, of 1.72 M HCl solution that will react with 2.67 mol of CaCO3?

If 160 g of KCI is dissolved in water to make 500ml solution,what is the molarity of the solution?

Give examples that illustrate the use of standard heats of formation in calculating changes in enthalpy or ΔH of reactions.

State that values of standard states of formation are important because these are

conveniently used to calculate changes in enthalpy, ΔH of many  reactions.  

Discuss standard state and give examples (Padolina et al., 1995)

1. Define heat of formation/standard heat of formation ΔHfo.

2. Discuss standard state and give examples (Padolina et al., 1995).

3. State that values of standard states of formation are important because these are conveniently used to calculate changes in enthalpy, ΔH of many reactions.

4. Give examples that illustrate the use of standard heats of formation in calculating changes in enthalpy or ΔH of reactions.

please answer correctly

What is the answer of?

1.

2.

3.

4

DEADLINE : 03/26/2022