Chem 101 Final

For the chemical reaction H2 (g) + F2 (g) > 2 HF (g) change in H= -79.2 kJ/mol. What is the Enthalpy for the reaction 3 H2 (g) + 3 F2 (g) > 6 HF (g)

-238 kJ/mol

How many moles of CH3OH are there in 50.0 mL of 0.400 M CH3OH?

0.0200 mol

How many moles of Al are necessary to form 23.6 g of AlBr3 from this reaction: 2 Al(s) + 3 Br2(l) > 2 AlBr3?

0.0885 mol

100.0 mL of a 0.500 M solution of KBr is diluted to 500.0 mL. What is the new concentration of the solution?

0.100 M

Determine the mass in grams of 3.00 x 10^21 atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.)

0.373 g

A 90.0 g piece of metal, initially at 98.6 degree C, is placed into 120.0 g of water initially at 24.3 degree C. If the final temperature of the water is 34.0 degree C, what is the specific heat of the metal? (The specific heat of water is 4.18 J/g*degree C).

0.84 J/g* degreeC

How many moles of lithium hydroxide would be required to produce 35.0 g of Li2CO3 in the following chemical reaction? 2 LiOH (s) + CO2 (g) > Li2CO3 (s) + HH2O (l)

0.947 mol

Convert 750.0 torr to atm.

0.9868 atm

A mixture of two gases with a total pressure of 2.00 atm contains 0.70 atm of Gas A. What is the partial pressure of Gas B?

1.30 atm

Convert 1.30 atm to Pa

1.32 x 10^5 Pa

How many atoms of vanadium are in 1.28 grams of vanadium?

1.51 x 10^22 atoms of V

How many atm is 23.4 psi?

1.59 atm

What is the mass percentage of Cl in hydrochlorothiazide, C7H8ClN3O4S2?

11.91 %

Determine the formula weight of KBr

119.00 amu

Fill in the blank: A mole is defined as the number of carbon atoms in _____ g of pure ^12C.

12

Determine the number of grams of C4H10 that are required to completely react to produce 8.70 mol of CO2 according to the following combustion reaction: 2 C4H10 (g) +13 O2(g) > 8CO2 (g) + 10 H2O (g)

126 g C4H10

For the chemical reaction Ca (s) + 1/2 O2 (g) > CaO (s) change in H= -635 kJ/mol. What is the Enthalpy for the reaction 2 CaO (s) > 2 Ca (s) + O2(g)?

1270 kJ/mol

For the chemical reaction Ca (s) +1/2 O2 (g) > CaO (s) change in H = -635 kJ/mol. What is the Enthalpy for the reaction 2 CaO (s) > 2 Ca (s) + O2 (g)?

1270 kJ/mol

How many calories are in 5401 J? (1 cal = 4.18 J)

1290 cal

A weather balloon calibrated at 0.00 degrees C to have a volume of 20.0 L has what volume at -40.0 degrees C assuming pressure is held constant?

17.1 L

If 801 J of heat is available, how many grams of iron (specific heat = 0.45 J/g*degree C) can be heated from 22.5 degree C to 120.0 degree C?

18.3 g

What volume (in mL) of 0.300 N HCl would be required to completely react with 5.00 g OG Al in the following reaction? 2 Al (s) + 6 HCl(aq) > 2 AlCl3(aq) + 2 H2 (g)

1850 mL

Complete the balanced neutralization equation for the reaction below: HNO3(aq) +Ba(OH)2(aq) > Ba(NO3)2(aq) + H2O(l)

2 HNO3(aq) +Ba(OH)2(aq) > Ba(NO3)2(aq) + 2 H2O(l)

How much heat will be absorbed by a 50.3 g piece I'd aluminum (specific heat = 0.930 J/g*degree C) as it changes temperature from 23.0 degrees C to 67.0 degree C?

2.06 kJ

A balloon at 30.0 degrees C has a volume of 222 mL. If the temperature is increased to 53.1 degrees C and the pressure remains constant, what will the new volume be, in mL?

238.9164 mL

If 50.0 g of CH3OH (MM=32.04 g/mol) are dissolved in 500.0 mL of solvent, what is the concentration of CH3OH in the resulting solution?

3.12 M

To what volume would you need to dilute 20.0 mL of a 1.40 M solution of LiCN to make a 0.900 M solution of LiCN?

311 mL

Determine the molar mass of CH3OH.

32.04 g/mol

How many grams of sodium are required to completely react with 19.2 L of Cl2 gas at STP according to the following chemical reaction? Remember 1 mol of an ideal gas has a volume of 22.4 L at STP 2 Na (s) + Cl2(g) > 2 Na Cl(s)

39.4 g Na

The oxidation number on the nitrogen in NO2 is

4

What is the oxidation number of S in the compound Na2S2O5?

4

Write a balanced chemical equation based on the following description: iron metal reacts with oxygen gas to produce solid iron (III) oxide.

4 Fe (s) + 3 O2 (g) > 2 Fe2O3 (s)

Determine the number of atoms of O in 92.3 moles of Cr3(PO4)2

4.45 x 10^26 atoms

What is the molar mass of an unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 degrees C?

48.9 g/mol

The oxidation number on the nitrogen in NO3- is

5

Nitrogen gas can be prepared by passing ammonia over copper(II) oxide, and the other products are copper metal and water vapor. If a sample containing 3.58 moles of NH3 is reacted with excess copper(II) oxide, how many grans of N2 will be formed?

50.2 g

How many mL of 0.300 M NaCl solution are required to produce 0.150 moles of NaCl?

500 mL

How many mililiters of 0.100 M HClO3 are required to neutralize 40.0 mL of 0.140 M KOH?

56.0 mL

How many milliliter of 0.0200 M Ca(OH)2 are required tp neutralize 75.0 mL of 0.0300 M Cl?

56.0 mL

Consider the image of a mercury manometer below. Based on the image, if the pressure of the atmosphere is 760.0 mmHg, the pressure of the gas is

623 mmHg

The oxidation number of Cl in HClO4 is

7

How many atoms are in 1.2 mol of carbon?

7.2264 x 10^23

What is the mass percentage of C in morphine, C17H19NO3?

71.56 %

In this reaction: Mg (s) +I2 (s) > MgI2 (s) If 2.34 moles of Mg react with 3.56 moles of I2, and 1.76 moles of MgI2 form, what is the percent yield?

75.2 %

How many moles of H2 are required to produce -2501 kJ of heat un the following reaction? N2 (g) + 3 H2 (g) > 2NH3 (g) Change of H= -91.8kJ/mol

81.7 mol

How many Joules are there in 2001 calories? (1 cal = 4.18 J)

8377 J

How many grams of H2 can be formed from 54.6 grams of NH3 in the following reaction? 2 NH3 (g) > 3 H2 (g) + N2 (g)

9.69 g

Which of the following has the greatest amount of potential energy?

A ball at the top of a hill

Which of the following represents an example of kinetic energy?

A ball rolling down a hill

A state function is best described as

A function that depends only on the starting point and ending point of a process.

In which one of the following processes is the system endothermic?

A process taking place in solution where the solution temperature decreases.

In the following chemical reaction, which element is the reducing agent? 2 Ag(s) + 2Cl-(aq) + 2 H20 (l) > 2 AgCl(s) + H2(g) + 2 OH-(aq) A) Ag B) Cl C) H D) O

A) Ag

What is the empirical formula for methamphetamine? A) C10H15N B) C10H12N C) C9H15N D) C10H14N E) Cannot be determined.

A) C10H15N

The analysis of a compound shows it contains 5.4 mol C, 7.2 mol H, and 1.8 mol N . What is the empirical formula of the compound? A) C3H4N B) C4H3N C) C5*4H7*2N1*8 D) CH1*3N

A) C3H4N

If a reaction is exothermic, what is. True of its reverse reaction? A) change in H > 0 B) change in H < 0 C) change in H = 0 D) Not enough info

A) Change in H > 0

Which one of the following represents the molecular equation for the reaction of HNO3 with CsOH? A) CsOH (aq) + HNO3 (aq) > H2O(l) + CsNO3 (aq) B) Cs+ (aq) + NO3- (aq) > CsNO3 (s) C) H+ (aq) + OH- (aq) > H2O (l) D) CsOH (aq) + HNO3 (aq) > H2O (aq) + CsNO3 (s)

A) CsOH (aq) + HNO3 (aq) > H2O(l) + CsNO3 (aq)

What is the empirical formula of a compound that contains only iron and oxygen and is 22.27% oxygen? A) FeO B) FeO2 C) Fe2O D) Fe7O2

A) FeO

If you have 5 mol H2 and 2 mol N2, what is the limiting reagent in the reaction below? 3 H2 (g) + N2 (g) > 2 NH3(g) A) H2 B) N2 C) NH3 D) Both reactants are limiting.

A) H2

In which of the following species does sulfur have the lowest oxidation number? A) S^2- B) S8 C) SO3^2- D) SO4^2- E) S2O3^2-

A) S^2-

In the following chemical reaction, which element is the oxidizing agent? 3 Sn(NO3)2 (aq) + 2 Fe(s) > 2 Fe(NO3)3 (aq) +3 Sn(s) A) Sn B) Fe C) N D) O

A) Sn

Which one of the following best describes Charles's Law? A) The volume of a gas is directly proportional to the temperature of the gas. B) The pressure of a gas is directly proportional to the temperature of the gas. C) The volume of a gas is directly proportional to the moles of a gas. D) The pressure of a gas is inversely proportional to the volume of a gas.

A) The volume of a gas us directly proportional to the temperature of the gas.

Equal amounts of heat are added to equal masses of substances A and B at the same temperature, but substance B gets hotter. What is true of their heat capacities (c)? A) c(A) > c(B) B) c(B) > c(A) C) c(a) = c(B) D) Not enough info

A) c(A) > c(B)

What is the difference between actual yield and theoretical yield?

Actual yield is how much is actually produced in a reaction (it has to be given or measured), and theoretical yield is a calculation that has to be done.

Predict the products and balance the following reaction: Ag2SO4(aq) + NaCl(aq) >

Ag2SO4(aq) + 2NaCl(aq) > Na2SO4(aq) + 2AgCl(s)

Balance the following chemical reaction: Al2(SO4)3 (aq) + K3PO4 (aq) > AlPO4 (s) +K2SO4 (aq)

Al2(SO4)3 (aq) + 2 K3PO4 (aq) > 2 AlPO4 (s) + 3 K2SO4 (aq)

Write the balanced equation for the reaction of solid potassium chlorite decomposing to form solid potassium chloride and oxygen gas. A) KClO3 (s) > KCl (s) + 3 O (g) B) 2 KClO3 (s) > 2 KCl (s) + 3 O2 (g) C) KClO4 (s) > KCl (s) + 2 O2 (g) D) KClO4 (s) > KCl (s) + 4 O (g)

B) 2 KClO3 (s) > 2 KCl (s) + 3 O2 (g)

What is the identity of a 100. G sample of metal that, upon absorbing 4680 J of heat, increases in temperature by 52.0 degrees C? A) Mg B) Al C) Ti D) Fe

B) Al

What is the molecular formula of a compound that contains only carbon and hydrogen, is 85.6% carbon, and has a molar mass of 70g/mol? A) CH2 B) C5H10 C) C5H5 D) C4H21

B) C5H10

A compound that contains only carbon, hydrogen, and oxygen is 58.8% C and 9.87% H by mass. What is the empirical formula of this substance? A) C2*5H50 B) C5H10O2 C) C6H4O D) C4H8O2 E) C5H5O2

B) C5H10O2

Which of the following reactions is a double displacement reaction? A) HCl (g) > H2 (g) + Cl2(g) B) HCl (aq) + NaOH (aq) > H2O (l) + NaCl (aq) C) Mg (s) + 2HCl (aq) > MgCl2 (aq) + H2 (g) D) HCl (g) + C5H10 (g) > C5H11Cl (g)

B) HCl (aq) + NaOH (aq) > H2O (l) + NaCl (aq)

An aqueous solution of Mg(NO3)2 and NaOH generates the solid precipitate Mg(OH)2. Which of the following would NOT appear in the corresponding net ionic reaction? A) Mg^2+ B) NO3- C) OH- D) Mg(OH)2 E) Both (A) and (C)

B) NO3-

Which one of the following processes is endothermic?

Boiling a liquid

That a gas increases in pressure as its volume decreases is a statement of

Boyle's Law

What gas law states that volume and pressure are inversely proportional at con state temperature and moles?

Boyle's Law

Which one of the following processes is exothermic?

Burning wood in a campfire

If you have 1 mol Xe and 1 mol F2, how many moles of XeF4 can you create in the following chemical reaction? Xe (g) + 2 F2 (g) > XeF4 (g) A) 2 mol B) 1 mol C) 0.5 mol D) 0.25 mol

C) 0.5 mol

Which one of the following contains the most moles of oxygen atoms? A) 1 mol of Fe(C2H3O2)3 B) 1 mol of Na3PO4 C) 2 mols of Ca(NO2)2 D) 3 mol of CH3OH

C) 2 mols of Ca(NO2)2

How many oxygen atoms are located on the reactant side of the following chemical equation? 2 Al(s) +Fe2O3(s) > Al2O3(s) +2 Fe(l) A) 1 B) 2 C) 3 D) 4 E) 5

C) 3

An 80.0 g sample of metal, initially at 96.0 degree C, is placed into 150. G of water initially at 26.0 degree C in a calorimeter. The finial temperature of the water is 28.1 degrees C. What is the identity of the metal? ( The specific heat of water is 4.18 J/g* degree C) A) Fe B) Sn C) Ag D) Cu

C) Ag

Liquid water at 50 degree C is heated to steam at 150 degrees C. Which piece of information is NOT required to determine the amount of heat that must be added for this change to occur? A) Specific heat of H2O(l) B) Specific heat of H2O (g) C) Change in H(fusion) D) Change in H (vaporization) E) All of the above are required

C) Change in H(fusion)

Which one of the equations below is an endothermic reaction? A) SrO (s) + CO2 (g) > SrCO3 (s) change in H = -234kJ/mol B) H2 (g) +F2 (g) > 2 HF (g) change in H = -79.2 kJ/mol C) H2 (g) +C (s) +N2 (g) > 2 HCN (g) change in H =270.3 kJ/mol D) 2 K (s) + 2 H2O (l) > 2 KOH (aq) + H2 (g) change in H = -393.1 kJ/mol

C) H2 (g) +C (s) +N2 (g) > 2 HCN (g) change in H =270.3 kJ/mol

In the following chemical reaction, which element is the oxidizing agent? CH4(g) + 2 O2(g) > CO2(G) + 2H2O(g) A) C B) H C) O D) There is no oxidizing agent in this reaction.

C) O

Which of the following has the shortest bond length? A) a single bond B) a double bond C) a triple bond

C) a triple bond

Write a balanced chemical equation based on the following description: the reaction of gaseous C5H4 with oxygen gas produces gaseous carbon dioxide and water vapor

C5H4 (g) + 6 O2 (g) > 5 CO2 (g) + 2 H2O (g)

A compound is combusted that contains only carbon and hydrogen, and it is found to be 85.6% C by mass. What is the compound's empirical formula? A) CH2 B) CH C) C6H D) C2H

CH2

What gas law states that volume and temperature are directly proportional at constant pressure and moles?

Charles' Law

Which one of the following processes is exothermic?

Condensation of a gas into a liquid

What are the coefficients in front of the H2 and the Au if you balance the following unbalanced equation: Au2S3 + H2 > Au + H2S A) 3,6 B) 6,4 C) 6,2 D) 3,2

D) 3,2

What is the molecular formula of a compound with an empirical formula of CH and a molar mass of 78.1 g/mol? A) C6H B) C2H2 C) C2H6 D) C6H6

D) C6H6

Which one of the following is an example of a state function? A) heat B) work C) distance D) Enthalpy

D) Enthalpy

An iron-containing compound is 20.1% Fe, 11.5% S, 63.3% O, and 5.1% H. What is the empirical formula for this compound? A) Fe3SO19H25 B) Fe15S9O50H C) FeS2O22H28 D) FeSO11H14

D) FeSO11H14

You have a two-liter sample of each of the following gases, at all 25 degrees C and one atmosphere pressure. Which sample will weigh the most? A) Ammonia B) Argon C) Carbon dioxide D) Nitrogen dioxide E) Oxygen

D) Nitrogen dioxide

Which choice correctly identifies the oxidation number (O.N.) for the given species? A) Mn^2+, O.N. = 0 B) Ca, O.N. = +2 C) F2, O.N. = -1 D) Se^2-, O.N. = -2 E) P4, O.N. = -1

D) Se^2-, O.N. = -2

The reaction of an alkane with oxygen to produce carbon dioxide and water is known as what? A) substitution B) displacement C) precipitation D) combustion D) double replacement

D) combustion

What type of reaction is represented by the following equation: C4H8 (g) + 6 O2 (g) > 4CO2 (g) + 4H2O (g) A) acid-base B) decomposition C) precipitation D) redox (oxidation-reduction)

D) redox (oxidation-reduction)

When water cools from 10 degree C and then freezes to become ice, which of the following best describes the heat flow between the system and surroundings? A) the energy of the universe is decreasing because the water is cold. B) the energy of the universe is increasing because the energy had to be removed from the water C) the water is absorbing energy as its temperature decreases, and that energy was released by the surroundings. D) the water is releasing energy as its temperature decreases, and that energy is absorbed by the surroundings

D) the water is releasing energy as its temperature decreases, and that energy is absorbed by the surroundings

Consider the following reaction: C6H14+19/2O2 > 7H20+6CO2 Here, C6H14 is a(n): A) Reactant B) Product C) Hydrocarbon D) Ion E) Both (A) and (C)

E) Both (A) and (C)

An unknown solid is added to water in a calorimeter. The temperature of the water increases. What does this say about the reaction?

E) Both A and D are correct

What is the difference between effusion and diffusion?

Effusion is through a pinhole, and diffusion is through open space.

A single bond, compared to a double bond,

Is longer

Write a balanced chemical equation based on the following description: solid lead (IV) chlorite decomposes to form solid lead (IV) chloride and oxygen gas.

Pb(ClO2)4 (s) > PbCl4 (s) + 4 O2 (g)

A lattice energy is

The amount of energy that must be supplied to break an ionic solid into its individual gaseous ions.

Work is best described as

The displacement of an object against a force

A bond dissociation energy is

The energy required to break a covalent bond.

When molecules absorb heat, there is an increase in

The kinetic energy of the molecules

An exothermic reaction causes the surroundings to

Warm up