1) Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxid

Question

1) Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxide gas, and water.

Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)

If you have 0.500 moles of Cu,

a you need at least 0.125 moles of HNO3 to produce 0.500 moles of Cu(NO3)2

b you need at least 0.250 moles of HNO3 to produce 0.500 moles of Cu(NO3)2

c you need at least 2.00 moles of HNO3 to produce 0.500 moles of Cu(NO3)2

d you need at least 2.00 moles of HNO3 to produce 1.00 moles of Cu(NO3)2

e you need at least 2.00 moles of HNO3 to produce 2.00 moles of Cu(NO3)2.

2) Molarity is defined as:

a The mass of solute dissolved in 1L solvent

b The number of moles of solute dissolved in 1L of solvent

c The number of moles of solute in a solution whose total volume is 1 L

d The number of moles of solvent divided by the volume of the solution (L)

e The number of moles of solute dissolved in 1kg of solvent.

3) How many moles of KBr can be produced from the reaction of 2.92 moles of potassium with 1.78 moles of Br2?

2K(s) + Br2(g) 2KBr(s)

a 1.46 moles

b 1.78 moles

c 2.92 moles

d 3.56 moles

e 5.84 moles

4) What amount of Br2 (in moles) reacts with 4.0 mol of Al to produce AlBr3?

2Al(s) + 3Br2(g) 2AlBr3(s)

a 2.0 moles

b 4.0 moles

c 6.0 moles

d 12.0 moles

e 16.0 moles

5) Disulfur dichloride is produced by reacting chlorine gas with molten sulfur.

S8(l) + 4Cl2(g) 4S2Cl2(g)

What is the percent yield if 6.25 g S2Cl2 is isolated from the reaction of 10.0g S8 and 7.50 g Cl2?

6) The compound P4S3 is used in matches. It reacts with oxygen to produce P4O10 and SO2. The UNBALANCED chemical equation is shown below.

P4S3(s) + O2(g) P4O10(s) + SO2(g) What mass of O2 will react with 0.641 g of P4S3?

Explanation / Answer

Multiple questions. Please split the last two parts.

1. (c)

Numer of moles required to produce 0.5 moles of Cu(NO3)2 = 0.5*4 = 2

2. (c) by definition

3. (d)

Br2 is the limiting reagent here since it would require 3.56 moles of potassium to consume entire amount of Br2.

Thus number of moles of KBr produced = 1.78*2 = 3.56

4. c

Number of moles = 3/2*(4) = 6 moles

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