If 4.90 g of Na₂CO₃ is dissolved in enough water to make 250. mL of solution, what is the molar concentration of the sodium carbonate?

Molar concentration of Na₂CO₃ = ______M

What are the molar concentrations of the Na⁺ and CO₃^2- ions?

Molar concentration of Na⁺ = ______M

Molar concentration of CO₃^2- = _______M

Balance each redox reaction occurring in acidic aqueous solution. Use the half-reaction method. Identify all phases in answer

A) IO3-(aq)+SO2(g)-------> I2(s)+SO4^2-aq)     B) Cr2O7^2- (aq) + Br- (aq)-----------> Cr^3+(aq) + Br(aq)

How many milliliters of 0.640 M HCl are needed to titrate each of the following solutions to the equivalence point?

(a) 30.2 mL of 0.640 M LiOH

_________ mL

(b) 60.8 mL of 0.768 M NaOH

________ mL

(c) 464.0 mL of a solution that contains 6.56 g of RbOH per liter

________ mL

Problem 4.26a Draw all possible structure(s) and give the IUPAC systematic name(s) of an alkane or cycloalkane with the formula C8H18 that has only primary hydrogen atoms. Select the IUPAC systematic name(s) (all drawn in previous step): 2,2,3-trimethylpentane octane 2,3-dimethylhexane 2-methylheptane methylcycloheptane 2,2,3,3-tetramethylbutane 1-methyl-2-ethyl-pentane 2,2-dimethylhexane

how can i Calculate those ??

1)Mass of Cu wire reacted

2)Mass of Ag produced

3)Mass of AgNO3 reacted

4)Moles of Cu reacted

5)Moles of AgNO3 reacted

6)Moles of Ag produced

7)Ratio of moles Ag to moles AgNO3

8)Ratio of moles Ag to moles Cu

9)Number of Cu atoms removed from wire

10)Number of Ag atoms produced

11)Theoretical yield of Ag

12)% Yield of Ag

A reaction is carried out by combining 65.00 mL of a 0.108 M sample of (NH4)3PO4 and 48.00 mL of a 0.230 M Fe9NO3)2 solution. The net ionic equation is :

3Fe^2+(aq) + 2PO4^3-(aq) ---> Fe3(PO4)2(s) balanced

1a) What is the mass of iron(II) phosphate (MM= 357.49 g/mol) produced in the reaction?

1b) What are the concentrations of the reacting ions (Fe^2+(aq) and PO4^3+(aq)) at the end of the reaction (assuming no change in volume)?

Explain the advantages and disadvantages of complex coordination polymerizations over other addition polymerizations

Why does LDH exist as a tetramer? What differences exist between LDHA and LDHB at the dimer interface? What would happen if LDH were monomeric?

develop a process flow for hydrogenation and friedel craft reaction

Iwhen performing the experiment for magnesium oxide :

Why is the empty crucible and cover fired to heat?

How critical are the suggested times for heating and cooling?

How can you tell when the magnesium metal has reacted cmpletely?

How cn you tell when the copper wire has reacted compleely?

What are the major sources of experimental error?

A) Without doing any calculations (just compare the correct K_sp values) complete the following statements:

B) For each of the salts on the left, match the salts on the right that can be compared directly, using K_sp values, to estimate solubilities. If more than one answer is correct, enter the letters without delimiting characters.

Write the expression for K_sp in terms of the solubility, s, for each salt, when dissolved in water.

Note: Multiply out any number and put it first in the K_sp expression. Combine all exponents for s.

C) Determine the relative solubilities of the following magnesium compounds:

Ka for hypochlorous acid, HClO, is 3.0x10-8.Calculate the pH after 10.0, 20.0, 30.0, and 40.0 mL of 0.100MNaOH have been added to 40.0 mL of 0.100 M HClO. I am mostly confused on when 40.0 mL is added, because that will be the equivalence point I believe.

Determine the heats of formation or the steric energies of the exo- and endo-anhydride adducts using a molecular mechanics program. What do these energies tell you about the mechanism of the reaction?

The rate constant for the reaction:

2A -> 2B + C

is 0.881M^-1*s^-1 at 333 degrees Celcius.

(a) Starting with a concentration of 0.0955 M, calculate the concentration of A after 12.5 seconds.

(b) Calculate the half-live when [A] = 0.0444 M.