Unlock document.
This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
For the complete combustion of 1.000 mole of methane gas at 298 K and 1 atm
pressure, DH° = -890.4 kJ/mol. What will be the heat released when 1.85 g of methane
is combusted under these conditions?
A)-103 kJ
B)103 kJ
C)-7701 kJ
D)7701 kJ
E)none of these
Elemental sulfur exists in two crystalline forms, rhombic and monoclinic. From the
following data, calculate the equilibrium temperature at which monoclinic sulfur and
rhombic sulfur are in equilibrium.
A) 446 K
B) 202 K
C) -202 K
D) -446 K
E) 0 K
A general reaction written as A + 2B --> C + 2D is studied and yields the following
data:
What is the numerical value of the rate constant?
A)0.053
B)1.19
C)2.37
D)5.63
E)none of these (A-D)
Select the correct molecular structure for the given species from the choices below:
PCl4+
A)pyramidal
B)tetrahedral
C)square planar
D)octahedral
E)none of these
The empirical formula of a compound with a mass percent composition of 6.78% H,
31.43% N, 39.76% Cl, and 22.03% Co is consistent with which of the following
complexes?
A) [Co(NH3)3Cl3]
B) [Co(NH3)4Cl2]Cl
C) [Co(NH3)5Cl]Cl2
D) [Co(NH3)6]Cl3
E) none of these
Using the following electronegativity values:
C2.5Cl3.0
H2.1O3.5
select from the following group the molecule that fits the given statement:
a)CH3CHO
b)CO2
c)CH3Cl
d)C2H6
e)none
This molecule is the most polar.
A)CH3CHO
B)CO2
C)CH3Cl
D)C2H6
E)All are nonpolar.
Consider the following portion of the energy-level diagram for hydrogen:
n = 4 −0.1361 x 10−18J
n = 3 −0.2420 x 10−18J
n = 2 −0.5445 x 10−18J
n = 1 −2.178 x 10−18J
The wavelength of light associated with the n = 2 to n = 1 electron transition in the
hydrogen spectrum is 1.216 ´ 10¯7m. By what coefficient should this wavelength be
multiplied to obtain the wavelength associated with the same electron transition in the
Li2+ion?
A)1/9
B)1/7
C)1/4
D)1/3
E)1
What is the cell potential at 25°C as read on the digital voltmeter?
A) 0.18 V
B) 2.58 V
C) 0.10 V
D) 0.59 V
E) 0.26 V
Which of the following lists of atoms are arranged in order of DECREASING atomic
radius?
A)Li > O > N > F
B)Li > N > O > F
C)F > O > N > Li
D)Na > Sr > O > F
E)Ca < Cs < S < Se
In which of the following does nitrogen have the highest oxidation state?
A)HNO3
B)NO2
C)N2O
D)NH4Cl
E)NaNO2
A voltaic cell consists of a Cu2+/Cu electrode ( red= 0.34 V) and an Au3+/Au electrode
(red= 1.50 V). Calculate [Au3+] if [Cu2+] = 1.20 M and = 1.13 V
A) 0.001 M
B) 0.002 M
C) 0.04 M
D) 0.2 M
E) 5.0 M
How many of the following postulates of Dalton's atomic theory are still scientifically
accepted?
I. All atoms of the same element are identical.
II. Compounds are combinations of different atoms.
III. A chemical reaction changes the way atoms are grouped together.
IV. Atoms are indestructible.
A)0
B)1
C)2
D)3
E)4
Determine Sunivfor the reaction (in kJ/mol K)
A) 0.23
B) 2.3
C) 0.36
D) 2.8
E) 3.6
What would be the g Al / mole S ratio for the product of a reaction between aluminum
and sulfur?
A)26.98 g Al / mol S
B)80.94 g Al / mol S
C)40.47 g Al / mol S
D)53.96 g Al / mol S
E)17.99 g Al / mol S
Consider the reaction:
When a 21.1-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how
much energy is released as heat?
Calculate the work associated with the expansion of a gas from 42.0 L to 79.0 L at a
constant pressure of 14.0atm.
Selecting from the following reagents, indicate which reagents would be mixed to give
the compounds described.
CuSO4(aq) Fe2(CO3)3 (s)NH3(aq)
CuCO3(s) FeCl3(aq) Na2SO4(aq)
Cr(OH)3(s) H2SO4(aq)
FeCl3(aq) + Na2SO4(aq)
Convert 34.4 lb to g. (1 lb = 453.6 g)
The reaction obeys the rate law:
at 500. K.
If the initial concentration of NO2is 1.00M, how long will it take for the [NO2] to
decrease to 35.8% of its initial value?
For the reaction aA --> Products, use the following choices
a) zero order in A
b) first order in A
c) second order in A
d) a, b, c
e) none of the above
The half-life is constant.
Write molecular equations for the following reactions:hydration of 2-butene
E ® 2D
DH for the process A --> 2C + E is
A line in the spectrum of atomic mercury has a wavelength of 254nm. When mercury
emits a photon of light at this wavelength, the frequency of this light is
