Constantine

Hi, could someone please take a look at my solution to this problem and let me know if it's correct? I would really appreciate some help. Calculate the theoretical yield for K3[Fe(C2O4)3]*3H2O; 491.258 g/mol Mass of Ferrous Ammonium Sulfate Hexahyrdreate:...

12 years ago

Hi, could someone please take a look at the following question? Use the data given below to construct a Born-Haber cycle to determine the lattice energy of CaO. DH°(kJ) Ca(s) → Ca(g) 193 Ca(g) → Ca⁺(g) + e⁻ 590 Ca⁺(g) → Ca2⁺(g) + e⁻ 1010 2 O(g) → O2(g) -4...

12 years ago

Hi Dr. Bob. Could you please take a look at the question below and my work? I'm not sure how to get the correct answer for this question. I would greatly appreciate your help! How many of the following molecules are polar? BrCl3 CS2 SiF4 SO3 A) 1 B) 2 C)...

12 years ago

Hello Dr.Bob. Could you please take a look at the following question? I know the correct answer for it, but I'm not sure how to go about solving it. Which ground state electronic configuration will most readily ionize to a 2 + cation? A) 1s22s22p63s23p64s...

12 years ago

Hello Dr.Bob. Could you check my work please? I'm not sure if I'm right in how I solved this problem. Which of the following nuclides are most likely to decay via beta decay? A) I-131 B) Pb-206 C) F-18 D) Zr-90 E) Ar-40 I know that nuclides undergo beta d...

12 years ago

Hi, I have a question regarding the following chemical equilibrium equation: 2CrO4^2- + 2H3O^+ <--> Cr2O7^2- + 3H2O The question is: how would you manipulate the above equation to produce more Cr2O7^2- ions without adding any Chromium based compounds? I u...

11 years ago

Hello, I would greatly appreciate some help with the following problem, as I'm not sure how to proceed. I'm trying to find solubility (Ksp) of Cu(IO3)2 from titration experiment. The following equations were provided: Cu(IO3)2 --> Cu^2+ + 2IO3^- Ksp = [Cu...

11 years ago

Hello! Could someone please take a look at the problem below and let me know if I made mistakes in simplifying the given equation? I'm quite certain that I did make a mistake somewhere because the original equation and its simplified form give different g...

10 years ago

Hello, Could somebody please help me with the following question? It asks to differentiate the function below according to derivate rules of calculus such as the power rule (if f(x)=x^n, then f'(x)=nx^n-1), the product rule (if F(x)=f(x)g(x) then F'(x)=f(...

10 years ago

Hello, I have a difficulty with the following question. The question is asking to find the slope of the tangent at x=3 for this function: f(x)=4x^3/sinx. X is measured in radians. The is the derivative of f(x): f'(x)=(12x^2)(sinx)^-1 + (4x^3)(-1)(sinx)^-2...

10 years ago

Hello, Could somebody kindly check my answer for the following question? Find the derivative of the following function: h(x)=3e^(sin(x+2)) h'(x)=3'(e^(sin(x+2))+3(e^(sin(x+2))' h'(x)=0(e^(sin(x+2))+3(e^(sin(x+2))(cos(1)) h'(x)=3cos1(e^(sin(x+2)) I would g...

10 years ago

WHO DOES THE JVC WORK FOR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

10 years ago

Hello, could somebody please help me out with the following question? I would greatly appreciate some assistance. Find all values of x in the interval [0, 2π] that satisfy the equation 3|tanx(x)|=3

9 years ago

Hi, I have a question regarding simplifying the following expression: (1/x)/((1/3)x^(-2/3)) = 3/3sqrtx The last expression reads three over cube root of x. I don't understand how to get from the expression on the left side of the equal sign to the one on...

9 years ago

Thank you Dr. Bob

12 years ago

Thank you Dr. Bob.

12 years ago

Tom is three times as old as Sam. So when Sam is 20, Tom will be three times as old as that. Multiply 20 by 3 and you will get 60. So when Sam is 20, Tom will be 60.

12 years ago

Thank you so much. I should've ignored the electronegativity factor.

12 years ago

The amount of coffee a person drinks is the independent variable because it is the variable that you would be manipulating to find out how that affects alertness which is the dependent variable.

11 years ago

Thank you Dr.Bob. I got it now.

11 years ago

Also, I forgot to mention that the molarity of Na2S2O3 was previously established to be 0.032 M.

11 years ago

Thank you much Dr. Bob!

11 years ago

Yes you are right, there is no such relation. Thank you so much for your help!

10 years ago

Thank you Steve! I understand it now.

10 years ago

Hi Steve, thank you for the reply. I think I got it.

10 years ago

Thank you Steve.

10 years ago

Steve, wouldn't I consider only the values for tanx=1 given the interval restriction?

9 years ago

Never mind, I understand it now. Thank you for your help, Steve.

9 years ago

Thank you for your help, Scott and Reiny.

9 years ago