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Questions (26)
i am a number between 30 and 40 When you put me into 8 equal groups there is an even number in each group and 1 is left over
1 answer
635 views
Consider an ionic compound, MX2, composed of generic metal M and generic halogen X.
The enthalphy of formation of MX2= -891. The
6 answers
3,361 views
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object.
3 answers
597 views
Which of the following electron configurations of neutral atoms represent excited states?
( ) [Xe]6s24f1 ( ) 2s2 ( )
7 answers
21,440 views
For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply.
( ) n=2,
4 answers
3,692 views
Enrico Fermi was a famous physicist who liked to pose what are now known as Fermi problems in which several assumptions are made
5 answers
4,521 views
Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0
5 answers
3,379 views
A 7.30-L container holds a mixture of two gases at 45 °C. The partial pressures of gas A and gas B, respectively, are 0.342 atm
1 answer
631 views
The organic compound di-n-butyl phthalate, C16H22O4(l), is sometimes used as a low-density (1.046 g·mL–1) manometer fluid.
3 answers
10,433 views
Container A holds 752 mL of ideal gas at 2.40 atm. Container B holds 179 mL of ideal gas at 4.80 atm. If the gases are allowed
6 answers
4,413 views
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 3.60 MJ
1 answer
1,153 views
What is the speed of a satellite in a geosynchronous orbit about Earth?
1 answer
501 views
An airplane flies from Boston to San Francisco (a distance of 5000 km) in the morning, then immediately returns to Boston. The
1 answer
1,671 views
In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is
0 answers
418 views
The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a
0 answers
557 views
Suppose that the swimmer in the figure below has a swimming speed relative to the water of 0.44 m/s, while the speed of the
1 answer
554 views
You are an astronaut (m = 90 kg) and travel to a planet that is the same mass and size as Earth, but it has a rotational period
0 answers
478 views
Consider the swimmer in the figure below. Suppose that his swimming speed relative to the water is 5.7 m/s, current = 2.2 m/s,
1 answer
551 views
When a spacecraft travels from Earth to the Moon, the gravitational force from Earth initially opposes this journey. Eventually,
1 answer
1,185 views
A roller coaster track is designed so that the car travels upside down on a certain portion of the track as shown in the figure
1 answer
1,316 views
A stone of mass 0.33 kg is tied to a string of length 0.65 m and is swung in a horizontal circle with speed v. The string has a
1 answer
577 views
A compact disc spins at 2.7 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the
0 answers
478 views
Consider again the problem of a car traveling along a banked turn. Sometimes roads have a "reversed" banking angle. That is, the
0 answers
632 views
Jennifer is a 29-year-old administrative assistant married to Antonio, an Italian engineer, whom Jennifer met four years earlier
1 answer
580 views
Jennifer is a 29-year-old administrative assistant married to Antonio, an Italian engineer, whom Jennifer met four years earlier
4 answers
1,167 views
The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's
Real Estate office. Its
2 answers
5,334 views
Answers (22)
Where would I add that in to my calculation? Like would it look like this: -Lattice energy of MX2=-891-(141+88.5+605+1392-678)
But what is the wavelenght? Do I use 5.40 nm?
I am having difficulty determining what would be the wavelength that I use to determine the velocity using de Broglie's equation.
Basically what I have found is: 1) excited Lu 2) He 3) excited Ca 4) V 5) Mo
I have counted the electrons for all of the five electron configurations. I have determined that as you mentioned [Xe]6s2 4f1 is the excited state of Lu. I also managed to find that the configuration 1s2 2s2 2p6 3s2 3p6 3d2 is the excited configuration of
Thanks.
I keep getting the answer to the volume of the atmosphere wrong. Are my calculations correct? Or what is my problem? I calculate that the total volume of Earth + thickness of atmosphere is: (4/3)*pi*(6450000 m)^3 = 1.124*10^21 I then calculate that the
It is not one question. It is a series of questions. First calculate the total volume of the atmosphere. Second calculate the total number of gas molecules in the atmosphere. Third calculate the number of gas molecules in Caesar's last breat. Fourth
I calculated the molar mass to be approximately 29 g/mol. Although I am not entirely sure whether that is the correct answer or not.
Makes sense now. Thank you.
So would it look like this: 2.40*752=P2*931 for gas 1 4.80*179=P2*931 for gas 2 Then add the two P2's that I get. Right?
Thanks. :)
I am having trouble trying to figure out what formula I can use to determine the partial pressure of each. Is it Boyle's Law?
A military gun is mounted on a railroad car (m = 1400 kg) as shown in the figure below There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 31 kg with a velocity of 285 m/s
Ok thanks, i was in betwwen congnitive and humanistic.
Psychodynamic Therapies Humanistic-Existential Therapy Behavior Therapy Cognitive Therapies Group, Couples, and Family Therapy
Well you see that answer does not match with one of the multiple choice rather it's and we know that it's not D so I'm assuming it's A then. A) 204 : 13 B) 191 : 13 C) 13 : 204 D) 13 : 191
I have gotten the answer already I have worked out the problem and I came up with 3.60 I mult. across. then added the answers all together..
D) 13 : 191
Can some one give me some hints please..
Can some one please help me with this one...
bobpursley on the first one it's a mult. choice which I have A) $0.00 B) -$1.00 C) -$0.85 D) -$0.83 where did you get $17 though? I don't understand this one.
