1. Chermistry

if molar enthalpy of vaporization of enthanol is 38.6 kJ/mol, how many moles of ethanol are vaporize when required heat is 200.72kJ

2. PreCalc

The area of a parking lot is 805 square meters. A car requires 5 square meters and a bus requires 32 square meters of space. At most 80 vehicles can park at one time. If the cost to park a car is $2.00 and the cost to park a bus is$6.00, how many buses

3. physics

A person walks first at a constant speed of 4.90 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.70 m/s. (a) What is her average speed over the entire trip?

4. Differential Equations

A cylindrical tank with length 5 ft and raduis of 3 ft is situated wit its axis horizontal. if a circular bottom hole with a radius of 1 in. is opened and the tank is initially half full of xylene, how long will it ake for the liquid to drain completely?

5. precalc

Without further study, you forget things as time passes. A model of human memory gives the percentage, p, of acquired knowledge that a person retains after t weeks. The formula is p = (100 – a)e-bt + a, where a and b vary from one person to another. If a

6. Physics

A car traveling 89 strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.81 . a.)What was the average acceleration of the driver during the collision? b.)Express the answer in terms of "'s," where .

7. writing english

reduce,reuse and recycle

fraction strip folded into 12ths what fractional length could you measure with the strip?

9. physics

A person walks first at a constant speed of 4.90 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.70 m/s. (a) What is her average speed over the entire trip?

10. science

my bedroom air conditioner blows very cold air at night,but only cool air during the day.my bedroom gets lots of direct sunlight all day long.what is your hypothesis

11. physics

During liftoff, a hot-air balloon accelerates upward at a rate of 3.4 m/s^2 . The balloonist drops an object over the side of the gondola when the speed is 18 m/s. What is the magnitude of the object’s acceleration after it is released (relative to the

78. HCA230

Compose a list in which you dentify the major components of health communication. Who is involved in each component? How does each component promote health communication? If not utilized, how would it reduce health communication? Provide examples.

79. Math

( -4 ) 3 (----) ( 5 ) if you can't read that, negative 4, fifths, squared. -4/5 in parentheses.

80. science

Juneau, Alaska has a dry winter season, even though it receives 53.2 inches of precipitation annually. Its average coolest-month temperature is 22'F, and its average warmest -month temperature is a surprising 56'F. What climate is it? a) Humid continental

81. social studies

What region produces more corn?

82. math

22*2/4-(7+3)2+3(7-2)2

83. physics

What are the dangers associated with electricity in your home? What can be done to limit or prevent the possibilities of dying or getting hurt?

84. math

What is the domain of f (x) = sqr root of x^2 - 5x - 14?

85. analytical chemistry

what accounts for the colour change from green to blue in the reaction below [Ni(H2O)6]Cl2 + 6NH3 --> [Ni(NH3)6]Cl2 + 6H2O

86. Geometry

Suppose B is the midpoint of AC. AB = 5x and BC = 3x + 4. Find AB.

87. math

Math out of box 1 2 3 4 5 this is called steps(s) 5 9 13 17 21 this is called tiles(t) we know you are adding 4, but what is the rule such as (S X S + 4-1-5)I know its not right so help then right the rule for this.

88. psychology

you like to play the violon, but doing so in front of people makes you nervous and you make mistakes, what is influencing your playing?

89. algebra

I just want to see if my answer for this problem is correct or not. The aswer I have is 3x^2-3/7x^3-3x^2-17x+6. I was just wondering.Can I factor my answer? 3x-3/7x-3*x+1/x^2-1

211. chm

The mass of Oceanis 1.8*10 to 21 kg.The ocean contains 1.076%sodium ion,Na+what is mass of sodium in ocean

212. math

(17-5)(6+5) Do you know what's an expression is? Can you teach me how to do it?

213. algebra 8th

-4.7-(-4.7) = 0 ???

Which economic system is the best olution to hanling a crisis of epic proportion.

215. math

we have a problem that my parents cant help with. 846*2=(...+40+...)*2=(800 over ...+...over2+6 over...)=(400+...+3)...=... ...means blank space for a number. Can you help with this problem, so that I can figure out the rest of the problems.Thanks

how do you simplify the expsession of nine - six divided by three

217. aed204

• The composition of the faculty, administration, and other staff accurately reflects the pluralistic composition of the United States. • Differences in academic achievement levels disappear between males and females, dominant and oppressed group

218. physics

what are the values of g,m1,m2,and d if f=g times m1 m2 all over d squared

219. Biology

Janet's boss calls her into the office to discuss why see failed to complete her project for the big meeting this afternoon. Janet's sympathic nervous system: A) makes her thoughts race for an excuse B) Makes her start to perspire C) Enables her to walk in

220. english

2.You will then post to the discussion board your writing strategies for developing your thesis. You will explore the features of the MyCompLab and summarize your experiences.

221. Biology

If it happens that a neurotransmitter binds to a receptor site and produces a negative voltage, the probablity: A) that the neurons are densely connected increases B) of an excitatory response increase C)That the receiving neuron will fire decrease D)that

222. math

what is 9cm=______in do I have to mutiply by 2.54 which equals 22.86,is i'm right or wrong?

223. math

is the answer for 3y+8=-13 be y=-7?

224. math

I'm very lost and frustrated about leaning the parallel and perpendicular lines like say for instance I'm looking at an arrow that is face down kind of of a right angle that has the letter K and L and the middle, can you please explained it to me

225. math

I need real life example word problems using to ngative interjers.

y+y+2=18

227. math

okay what is a right angle triangle that has the letter k and L in the middle I know it's 90 degrees angle but I don't know forsure what i'm doing

228. algebra

i don't know how to do this 1/2> on the top is??? on the right 1/2 on the butttomm?????

229. english

Why is making a weakness a strength an important skill to have?

230. math

Factor: 20+22v-12v^2