Chemistry Answers

2 AlBr₃ + 3 Cl₂ → 2 AlCl₃ + 3 Br₂

If a reaction occurs using 3.75 moles AlBr₃, how many moles of Br₂ would be produced? 

A 10 percent (W/V) salt solution is used in making pickles.what Mass of salt is present in 750 ml of this solution

b)  Answer the following stoichiometry questions by referring to the equation below:

2

KClO₃               2 KCl + 3 O₂

i.        If 1.50 moles of KClO₃ decomposes, what is the mass of O₂ that will be produced?

ii.       If 80.0 grams of O₂ was produced, how many moles of KClO₃ are decomposed?

iii.    Find the mass of KClO₃ needed if we need to produce 2.75 moles of KCl.

200.0 g of Ca(C₂H₃O₂)₂ was found in the chemistry laboratory. 

      Calculate

          i. the molecular mass of 1 mole Ca(C₂H₃O₂) _2.

         ii. the number of  moles of Ca(C₂H₃O₂)₂  that exists   

        iii. the number of Ca(C₂H₃O₂)₂ molecules present

        iv.  the volume at STP  if Ca(C₂H₃O₂)₂ is converted to gas.

        v.  the molarity of a solution made by dissolving 200.0 g of      

                Ca(C₂H₃O₂)₂ in 200 ml of water

Calculate the number of atoms of He(g) that are needed to exert a pressure of 4.0 atm in a 15 mL container at a temperature of -23℃

Which of the following has the lowest vapor pressure at room temperature and 1 atm pressure?

CH₃CH₃

CH₃OCH₃

CH₃CH₂OH

CH₃OH

CH₄

What is the buffering region for octanic acid that has pKa = 4.89?

what volume (in mL) of 18.0M H2SO4 is needed to contain 2.45g H2SO4

the reaction of diatomic fluorine gas with compound X yields a single product, compound Y. The mass percent composition of the product, compound Y is 61.7%F2 and 38.3%Cl. What is the probable empirical formula for product Y?

. A 0.01 M HCl solution is diluted with water hundred times. 1. The pH of the solution increases by 2. 2. The pOH of the solution increases by 2. 3. The hydronium ion concentration of the solution decreases from10─2 M to10─4 M. 4. The hydroxide ion concentration of the solution does not change.