Im trying to solve this chem problem..?
You've got all the information you need, you just need to put it together. A way to help find the answer and avoid mistakes is to always write out your units - that way, you can make sure that your answer makes sense because your units should cancel or end up on the proper side of the fraction if you did your work correctly. Given: .1687g of CaCO3 100.09 g/mol CaCo3 If you take .1687g and divide by 100.09 g/mol, the grams cancel, giving you the number of moles: .1687g / 100.09 g/mol = 0.001685 mol CaCO3. Now that you have the # of moles of CaCO3, you need to find how many moles of Ca are in CaCO3. in this case, there is only 1 mole (because there is no subscript next to Ca). Thus, in your 100 mL solution you have 0.001685 mol Ca 2+. Concentration is expressed as Molarity, or mol/L. You have moles and mL (convertable to L), so just plug it in: Concentration = 0.001685 mol Ca / .1 L = 0.01685 M (solution)
How do i solve this 2 column proof? i am having trouble with these lately.?
Well, I can't solve your first proof because you haven't provided enough information, but I can tell you what your problem is. There's no way to do that first proof because I'd have to see the diagram. I have no idea where points C and W are with respect to the angles. I also suspect that there is additional information in the diagram that would be necessary. I think the reason you're having troubles is that you don't really understand the terminology and the orthography. Meaning no offense, but I think you're not putting the effort into learning it. If you truly understood what, for instance, it means for one angle to be congruent to another and if you understood the notation used to indicate angles, there's no way you'd have missed that one needs to see the diagram to do this proof. Go back to the first chapter in your textbook and make yourself a glossary. Every new term that shows up in the text, write it in your glossary along with the definition and any symbols used to indicate it. For instance, the first time you see the word "point", write some type of definition (which will be harder for point than for any other term), and then indicate that capital letters will indicate points. For line, it's lower case letters or two points side by side with a double-headed arrow above them. And so on. Once you have that, the proofs will get a little easier. Now: I can't do the second one either because I don't know what postulates and theorems your book uses. I can do it four or five different ways, depending on the textbook or if we're just using Euclid's postulates, and I don't want to try to guess which ones you're using. I would suggest you do the same thing with the postulates and theorems that I suggested with the definitions. Yes, it's a lot of work. However, I've had my students do that for years, and it always helps the ones who actually follow through with it.
I am having trouble trying to solve these, can someone please show me how?
A + 2 B → C ΔHrxn = -55 kJ The negative ΔH tells us that the reaction is exothermic, and therefore, the heat term should be placed on the right side of the equation as follows: A + 2 B → C + 55 kJ According to the above equation the heat emitted when each of the following completely reacts is (a) 1 mol A = 55 kJ (b) 2 mol A = 2 x 55 kJ = 110 kJ (c) 1 mol B = ½ (55 kJ) = 27.5 kJ (d) 2 mol B = 55 kJ
Im having a lot of trouble trying to solve this question. I don't know whether I should combine the 2 equations or leave it as it is.?
your balanced equations .. 2 C2H6 + 7 O2 ---> 4 CO2 + 6 H2O .. 1 C3H8 + 5 O2 ---> 3 CO2 + 4 H2O moles CO2 produced .. n = PV/(RT) .. .. = (100kPa x 1atm/101.325kPa) x (1.676L) / ((0.08206 Latm/molK) x (298.15K)) .. n = 0.06761 now if we let Z = mass C2H6.. then mass C3H8 = (1.000g - Z) so that from a mole balance of CO2 .. mole CO2 from C2H6 + mole CO2 from C3H8 = mole CO2 produced and converting from mass C2H6 and C3H8 to moles CO2 .. ... .. 1 mol C2H6.. ..4 mol CO2.. ... ... ... ... .. ... . 1 mol C3H8.. .3 mol CO2 .. Z x ---- ---- ---- --- x ----- ----- ---- + (1.000 - Z) x ---- ---- ---- --- x --- ---- ---- -- = 0.06761 .. .. . .30.07g C2H6.. 2 mol C2H6... ... ... .. ... .. . .44.10g C3H8.. .1mol C3H8 solving for Z .. 0.06651*Z + 0.06817 - 0.06817*Z = 0.06761 .. -0.00166*Z = -0.00056 .. Z = 0.337g and therefore .. % C2H6 = (0.337g / 1.000g) x 100% = 33.7% I'll let you figure out the sig figs
I am trying to solve this Discrete Structures problem. Please help?
Six new employees, two of whom are married to each other, are to be assigned six desks that are lined up in a row. If the assignment of employees to desks is made randomly, what is the probability that the married couple will have nonadjacent desks? (Hint: Find the probability that the couple will have adjacent desks, then subtract this number from 1.)
What problem does Uber solve?
I've been an UberX driver for two months. Below are ways in which Uber and other app-based transportation systems differ from the traditional cab system. Each is a problem with the traditional system that Uber solves. For the rider 1. Accountability - Uber ensures that would-be riders have certainty they are being picked up and that their ride won't abandon them because he was hailed en route.2. Customer Service - Because of the rating system drivers and riders are conscious of their conduct. Both have incentive to behave and respect the other party as both rank each other after the ride is complete. Drivers must maintain a high rating (above 4.5) in order to continue being drivers. 3. Ease of pay - No cash necessary and therefore no need to worry about the always-broken credit card machine. 4. Supply - Because of price surging, which incentivized more drivers to sign on during busy times, passengers have a higher chance of finding a ride at all times. For the driver1. Safety - Removing cash from the cab industry disincentivizes robbery and theft for drivers. 2. Choice - Because of the rating system drivers have access to what the driving community thinks of passengers before they pick them up. This essentially weeds out "bad riders" much in the same way it weeds out bad drivers. Uber also ensures drivers are compensated incase riders vomit in their vehicles. 3. Information - The Uber driver application gives real-time updates on the busiest (and surging) areas giving drivers a higher chance of finding riders. Uber also regularly emails and text drivers about main events happening thoughout the city as well as road closures so that drivers increase efficiency and maximize earning potential. I'm sure there are many more problems Uber solves (and perhaps creates). These are just the most prominent in my opinion.
What is the most important problem your company is trying to solve in moving toward an "agile" software development methodology?
In a nutshell, project estimation. I've worked at places where waterfall was required by the business and that's all well and good, but doing all the estimation upfront can lead to errors multiplying. When you have small, discrete tasks, the error in estimation is also smaller. It makes it less likely that a large surprise is hidden in the project somewhere, waiting to be discovered a few weeks before your promised launch date.With agile, I consider project planning part of the application design process. The user stories become the specification, the tasks become the estimate. In a user story, there is no unit of time longer than a sprint (usually 2-4 weeks). In a task, there is no unit of time longer than a day. If you have a user story longer than a sprint or a task that takes longer than a day, you need to break them up into smaller pieces. In doing so, you often find you have to think about your design more carefully, maybe refactor it. This refactoring usually leads to a better design that is more easily understood and as a consequence easier to maintain and extend.It is important that your application design and development plan be easily understandable at every level. The restrictions that an agile process places on you helps by preventing some really clever software developer from building something that no one else can understand.
Solve for x: 3x/2 - 4/x = 5x/2?
Solution: (3x^2 - 8) * 2x = 5x / 2 3x^2 - 8 = (5x / 2) * ( 1 / 2x) --->cancel out x 4 * (3x^2 - 8) = (5 / 4) * 4 ---->cancel out 4 12x^2 - 32 = 5 12x^2 - 32- 5 = 0 12x^2 - 27 = 0 ; x^2 - (27/12) = 0 ; x^2 = (9 / 4) x^2 = 9 / 4 x = √(9/4) x = + (3/2) x = - (3/2)