Recent content by Saturnfirefly

*Actual yield of C₉H₈O₄: 0.11 g ± 5,8% *Theoretical yield of C₉H₈O₄: 0.25 g *Percent yield: (0.11/0.25)x100 = 43% ± 5,8% Have I done anything wrong when taking the percent error down? Help...=/

Please, please look at the document I've attatched. My questions are: Have I done the calculations correct? Do I have correct significant figures? I have to discuss the random and systematic errors... but I don't know what ones that we've had. Help? And they tell us to point out...

I've solved the last one. But the two first I can't get at all :(...

Homework Statement 1, 2. Factorize completely: 80t^5-5t 3X-9X^2+12 solve: 3. 1/2x = 1/6+1/3X 4. A right-angle triangle has the hypotenuse 16.0, one of the short sides is 3 cm longer than the other. Area and perimeter? Homework Equations The Attempt at a Solution 1...

thank you, anyone that can clarify the rest? and should Zn be aq in the reaction?

Hi! I'm writing a lab report and have some questions that I can't find the answer of... I really hope that someone can help me. Homework Statement 1. First of... I'm having a small problem with writing an equation for Zn reacting with a HCl solution (only H+ should be in the equation). 2...

Homework Statement A: 1 To play tennis at the local tennis club costs 150 kr/hour for non-members and 90 kr/hour for members. A membership costs 2100 kr a year. How many hous of tennis does one have to play to make it wothwhile to be a member? (kr is the swedish currency) 2 In a...

Oh, thought you were supposed to grade it as in some swedish forums :D. Well, thank you again!

Thank you very much! I got the right answer now. Am I supposed to grade the help I got? If so, how? I'll probably have some more questions tonight... can I just post it in here or should I create a new thread?

Homework Statement 6+X = 3+(X/2) ---- X Homework Equations Quadratic formula? The Attempt at a Solution 2(6+X) = 3+X ------ X 12+2X = 3+X ------ X 12+2X = X(3+X) 12+2X = 3X-X^2 so, X^2+X-12 when putting it in the quadratic formula, I don't get the right...

Homework Statement 1. When light travels from a material to air, total reflection occurs beyond 54 degrees. Calculate the index of refraction. 2. A converging lens has a focal length of 20 cm. When an object is placed at a certain disctance from the lens, a virtual image is created. How far...