Sunday

February 19, 2017
Total # Posts: 145

**DrBob222 PLEASE HELP!**

I posted this question already but you never replied back :( Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer...

*March 17, 2012*

**chemistry**

Change in Hf(kJ/mol) Change in G Change in S C(graphite) 0 0 5.7 Cl2 0 0 223.1 CCl4 -139 -68.6 214.4

*March 16, 2012*

**chemistry**

Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=-253.3J/mol*K deltaS(surr)=466.4 J/mol*K ...

*March 16, 2012*

**physics**

(largest) R_outer: .6m R_inner: .5m R_outer: .4m R_inner: .3m R_outer: .4m, R_outer: .2m R_inner: .2m , R_inner: .1m R_outer: .6m R_inner: .2m (smallest)

*August 8, 2011*

**Math**

You are ﬁ ve feet tall and cast a seven-foot eight-inch shadow. At the same time, a basketball hoop casts a 19-foot shadow. How tall is the basketball hoop? Assume the triangles are similar.

*April 6, 2011*

**social studies**

who was the self made millionare from florida who started the door-to-door sale after the civil war???????? I NEED HELP!

*March 14, 2011*

**math**

The gas tank in Micheal's car can hold 18.0 gallons. If the tank currently contains 5.5 gallons, what fraction of the tank is full?

*February 16, 2011*

**projectile motion**

You have a boat with a motor that propels it at vboat = 4.5 m/s relative to the water. You point it directly across the river and find that when you reach the other side, you have traveled a total distance of 27 m (indicated by the dotted line in the diagram) and wound up 14 m...

*November 14, 2010*

**projectile motion**

A home run just clears a fence 105 m from home plate. The fence is 4.00 m higher than the height at which the batter struck the ball, and the ball left the bat at a 31.0° angle above the horizontal. At what speed did the ball leave the bat

*November 14, 2010*

**projectile motion**

You fire a squirt gun horizontally from an open window in a multistory building and make note of where the spray hits the ground. Then you walk up to a window 5.0 m higher and fire the squirt gun again, discovering that the water goes 1.5 times as far. Ignore air resistance. ...

*November 14, 2010*

**physics**

A juggler throws a ball from height of 0.950 m with a vertical velocity of +5.50 m/s and misses it on the way down. What is its velocity when it hits the ground?

*November 14, 2010*

**6th grade english**

it is present

*November 14, 2010*

**1st grade**

He drove past the dog

*November 8, 2010*

**PHYSICS ---HELP!**

how would I show that in m/s?

*October 6, 2010*

**PHYSICS ---HELP!**

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?

*October 6, 2010*

**PHYSICS ---HELP!**

Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

*October 6, 2010*

**SETS AND COUNTING**

In a survey of 289 college students, it is found that 65 like Brussels sprouts, 93 like broccoli, 55 like cauliflower, 28 like both Brussels sprouts and broccoli, 24 like both Brussels sprouts and cauliflower, 20 like both broccoli and cauliflower, and 13 of the students like...

*October 4, 2010*

**MATH SETS AND COUNTING**

There are a total of 103 foreign language students in a high school where they offer only Spanish, French, and German. You are given the following details for this semester: 44 take Spanish. 44 take French. 42 take German. 7 take Spanish and French but not German. 5 take ...

*October 4, 2010*

**MATH**

Find the monthly payments for an ordinary annuity that will yield a future value of $122000 at % interest for 22 years. payment

*September 22, 2010*

**chemistry**

[Cu(NH3)4]2+ + SO4(aq)2 + H2O [Cu(NH3)4]SO4•1H2O What is the theoretical yield of the products?

*September 14, 2010*

**alg. II**

Graph and state domain and range: f(x)=[x] (greatest integer function)

*July 5, 2010*

**Math**

katie is going to adopt kittens from a litter of 11. how many ways can she choose a group of 3 kittens?

*May 5, 2010*

**English**

It's an indefinite prounoun

*April 5, 2010*

**English Lit**

Thank you!!!

*April 2, 2010*

**English Lit**

I need help on proof reading this story. Christmas should be a time of celebrating the birth of Christ, but it seems like people make it more about themselves and what should they get for each other and who’s gift is more expensive or how we can compete when it comes to ...

*April 2, 2010*

**Algebra**

trains a and b are traveling in the same direction on parallel tracks. train a is traveling at 60 miles per hour and train b is traveling at 64 miles per hour. train a passes a station at 1:25 pm. if train b passes the same station at 1:55 pm, at what time will train b catch ...

*March 1, 2010*

**Algebra 1- 8th Grade**

Find each product. 1) 2t(t + 2) 2) (2n +1) * (n - 4)

*April 30, 2009*

**Algebra 1- 8th Grade**

According to the 1990 Census, the population of the United States was 2.49 x 10^8. The cost of taking the census in 1990 was 2.6 x 10^9 dollars. How much did the census cost per person in the United States?

*April 29, 2009*

**Physics**

for gamma radiation 1rad=1rem, but for alpha radiation 1 rad=20rem. Why is there a difference?

*January 14, 2009*

**math**

i do not know

*October 16, 2008*

**Biology**

Describe two scientific theory (atomic,kinetic,cell theory) and non scientic (moral, ethical, religious theories ).Differentiate between the scientific and non scientific theories explaining why there are some questions that science cnnot answer.

*October 1, 2008*

**history**

thank-you! i thought i posted the article but it looks like i didnt...

*September 17, 2008*

**history**

can someone tell me what this article is about? just type it in google- I don't really understand it. What I got from it is that Mcain is sort of going back on what he said years ago but i don't really get it. McCain Embraces Regulation After Many Years of Opposition

*September 17, 2008*

**history**

can someone help me write a thesis statement about susan B. Anthony and her role for helping women. It needs to be something along the lines of: Without Anthon'y creation of..........would not have been possible or Susan Anthony made the greatest contribution to women'...

*September 4, 2008*

**math**

A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes and the return trip takes 15 minutes. What is the speed of the current?

*September 3, 2008*

**math**

A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes and the return trip takes 15 minutes. What is the speed of the current?

*September 3, 2008*

**math**

I DON'T UNDERSTAND WHAT THE ANSWER WOULD BE....

*September 2, 2008*

**math**

Wendy is a loan officer and has 1,000,000 to lend and is required to get an average return of 18% per year. If she can lend at the rate of 19% or at the rate of 16%, how much can she lend at 16% rate and still meet the requirement?

*September 2, 2008*

**Economics**

Demand function for Zatab: Qd = 15.0 - 0.2P Production cost per unit: $5 Mirk Labs incurred a $60 million R&D cost 1) What wholesale price will Mirk Labs set? 2) How much Zatab will it produce and sell annually? 3) How much annual profit does the firm make on Zatab?

*March 10, 2008*

**Economics**

Demand function for Zatab: Qd = 15.0 - 0.2P Q = annual quantity demanded P = wholesale price of one Zatab unit Production cost per unit: $5 Mirk Lab incurred a $60 million R&D cost a decade ago 1: What wholesale price will Mirk Labs set? 2: How much Zatab will it produce and ...

*March 10, 2008*

**Economics**

Hello, I'm kind of struggling with this question. Can someone please help clarify this question. Since stock price beta tend to vary depending on the time frame analyzed, daily, weekly, and monthly. How do these factors influence or undermine the usefulness of beta as a ...

*March 9, 2008*

**physics**

A positive and a negative charge, each of magnitude 1.7 10-5 C, are separated by a distance of 11 cm. Find the force on each of the particles. what formula do i use?

*January 12, 2008*

**Math**

as in 5x5

*September 30, 2007*

**Math**

wat is 5 times 5?

*September 30, 2007*

**ETH125**

I'm having a hard time understanding the Checkpoint assignment on Legislation Legacy...Can anyone help me? Here is the question: Post a summar of a current issue between Native Americans and the federal government. Identify the legislation that you think is linked to the ...

*June 23, 2007*