General Chemistry Answers

How many moles of KBrO3 are required to prepare 0.0700 moles of Br2 according to the reaction: KBrO3 + 5KBr + 6HNO3 6KNO3 + 3Br2 + 3H2O *

A. 0.210

B. 0.0732

C. 0.0704

D. 0.220

A 500mL solution is made by dissolving 30.0g of NaCl in water. What is the molarity of the solution? *

A. 0.03

B. 1.03

C. 2.03

D. 3.03

A 50-g aqueous solution of phosphoric acid (H3PO4) contains 10.0 g of phosphoric acid. What is the mole fraction of solute? *

A. 0.0501

B. 0.0439

C. 0.415

D. 0.604

A solution is prepared by dissolving 25g of sucrose in 300 g of water. What is the % by mass of the solute? *

A. 6.55%

B. 9.09%

C. 7.69%

D. 8.33%

A solution is prepared by dissolving 25g of sucrose in 300 g of water. What is the % by mass of the solute? *

A. 6.55%

B. 9.09%

C. 7.69%

D. 8.33%

What is the concentration, in percent by volume, of 15.3 mL of solute in 2.65 L of solution? *

0.0058%

B. 0.0585%

C. 0.58%

D. 5.8%

how many grams are in 2.00 mol of sodium chloride (NaCl)?

The enthalpy and entropy change of a reaction are -3.9 3.9kJ / mole and +56.6 J/mole K respectively at 250 C. What is the free energy change in kJ / mole ? Is this reaction always spontaneous, never spontaneous or does it depend on the temperature ?

6.02x10^-3 / 3.01x10^-2

Using the reaction on below:

Sn(s) + Pb²+ (aq) → Sn²+ (aq) + Pb(s)

a. Write the oxidation and reduction half reaction.

b. Construct a cell diagram.

c. Write the overall equation of the reaction.

d. Solve for the cell potential.