Chemistry 121N Final Exam 2

The molecular weight of ethylene glycol is 62.0 amu. What is the mass of one molecule of ethylene glycol?

1.03 × 10-22 g

Which of the following approximates the H—N—H bond angle in ammonia, NH3?

107.3°

What bond angle is most closely associated with a tetrahedral distribution of electron density?

109.5°

How many oxygen atoms are present in 5.20 mol of Al2(SO4)3?

3.76 × 10^25

The combustion of one mole of propane, C3H8, releases 531 kcal. How much heat is released by the combustion of 4.40 g of propane?

53.1 kcal

Ethanol is produced industrially by the acid catalyzed reaction of ethylene with water. The balanced equation for this reaction is: C2H4(g) + H2O(g) → C2H5OH(l) If water is present in excess, how many grams of ethanol can be produced from 42.7 g of ethylene?

70.1 g

Which of the following molecules is(are) polar?

NH3

In the reaction Pb(s) + 2 Ag+(aq) → Pb2+(aq) + 2 Ag(s), which species is the reducing agent?

Pb(s)

What is the systematic name of CS2?

carbon disulfide

Which of the following elements is most electronegative? a. B b. C c. N d. O

d. O

When solutions of AgNO3 and NaOH react, the balanced molecular equation is: 2 AgNO3(aq) + 2 NaOH(aq) → Ag2O(s) + 2 NaNO3(aq) + H2O(l) How much Ag2O is produced when 0.200 g of AgNO3 and 0.200 g of NaOH react?

0.136 g

In an experiment to prepare aspirin, the percent yield was 94.3%. If the actual yield was 124.3 g, what was the theoretical yield for this experiment?

132 g

In the industrial synthesis of acetic acid, methanol is reacted with carbon monoxide. The balanced equation for this reaction is: CH3OH(g) + CO(g) → CH3COOH(l) If methanol is present in excess, how many moles of CO(g) are required to produce 16.6 moles of acetic acid?

16.6

How many electrons are associated with a single bond?

2

The reaction of nitric acid, HNO3(aq), with calcium carbonate, CaCO3(s) produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

2 HNO3(aq) + CaCO3(s) → Ca(NO3)2(aq) + CO2(g) + H2O(l)

Which of the following is the correct set of integer coefficients for the balanced equation, respectively: ___ C6H14(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

2, 19, 12, 14

How many moles of marble, CaCO3, are there in a 275 g piece of marble?

2.75

In the reaction Pb(s) + 2 Ag+(aq) → Pb2+(aq) + 2 Ag(s), which species is reduced?

Ag+(aq)

In which of the following molecules does the carbon atom have a nearly trigonal planar distribution of electron density?

C2H4

Which of the following compounds is insoluble in water?

CaCO3

Which of the following is the correct way to write the formula of the compound formed between the calcium ion and the sulfate ion?

CaSO4

Which of the following bonds is the most polar?

C—F

When a solution of ammonium chloride, NH4Cl, is added to a solution of lead(II) nitrate, Pb(NO3)2, a white precipitate of lead chloride, PbCl2, forms. Which of the following is the net ionic equation for this reaction?

Pb2+(aq) + 2 Cl-(aq) → PbCl2(s)

Which of the following occurs when a sulfur atom is converted to S2-?

The sulfur atom gains two electrons.

A compound used in the treatment of manic depression has the formula Li2CO3. Which of the following is the correct name for this compound?

lithium carbonate