Jefferson

This page lists questions and answers that were posted by visitors named Jefferson.

Questions

The following questions were asked by visitors named Jefferson.

A sample of 25.00 mL of 0.100 M HNO2(in a flask) is titrated with 0.150 M of NaOH solution at 25 degrees. 1) calculate the volume(Ve) of the NaOH solution needed to completely neutralize the acid in the flask. 2)calculate the pH for (a)the initial acid so...

NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.050 M in NH4Cl?

Lead(II) carbonate decomposes to form Lead(II) oxide and carbon dioxide. If 5.oo grams of the reactant decomposes to produce 1.52 grams of Lead(II) oxide experimentally, what is the theoretical yield and percent yield.

A strip of zinc medal weighing 2.00 grams is placed in an aqueous solution containing 150.ml of .750M Tin(II) nitrate. Determine the grams of tin metal that will be precipitated.

How many grams of water are produced when 10.0g of Butane, C4H10(g) completely combust with 2.50 moles of Oxygen gas?

How many grams of water will be produced in the complete combustion of 20.0g of Octane, C8H18(g) and 50.0g Oxygen gas?

#6. If 10.0g of Aluminum carbonate(s) decomposes to produce aluminum oxide(s) and carbon dioxide(g), how many grams of CO2(g) are formed? If 5.00g is recovered experimentally what is the % yield?

#5 Limiting Reactants How many grams of water will be produced in the complete combustion of 20.0 grams of Octane, C8H18(g) and 50.0 grams Oxygen gas?

How many grams of solid product should form if 4.90 grams of sodium phosphate is mixed with 25 ml of .875M barium nitrate?

Find the second derivative of y^2 = 4rp

if 20% of m is 80$ of p, then p is x% of m?

Suppose a small cannonball weighing 16 pounds is shot vertically upward, with an initial velocity v0 = 300 ft/s. The answer to the question "How high does the cannonball go?" depends on whether we take air resistance into account. If air resistance is ign...

Find the general solution of the given differential equation. x dy/dx − y = x^2 sin x I have solved to: y = -x cos(x) + cx The second part of the question is to give the largest interval over which the general solution is defined. I would think it would b...

How to solve y''+y=sin(x) by separation of variables?

We are learning how to solve systems of linear ODE's by elimination. I am not sure how to solve this: x'=-y+t y'=x-t I took the derivative of the second eqn to get y''-x'=-t' and added the two to get y''+y=-t'+t but I don't think thats the right way to pr...

We have a question: X'={{1,0,0} {-4,1,0} {3,6,2}}X; X(0)={-1,2,-30} I have worked out to the general solution but I don't think it's right. I have: X=C1 {0,0,1}e^2t + C2 {0,-1,6} e^t + C3 [{0,-2,6} + {0,-1,6}t] e^t this gives me x(t)=0....

Jonah and his friends go apple picking. Jonah fills 5 baskets. Each basket holds 15 apples. If 4 of jonah's friends pick the same amount as jonah, how many do jonah and his friends pick in all? Draw a diagram to the problem.

Answers

The following answers were posted by visitors named Jefferson.

got it!! the answer is 0.6 and it was correct!! Thank you so so much!!

The number that is IX more tham XC

I worked it out without the integrating factor. I end up with v=-m/k Ce^-(kt/m) - mg/k In webassign, if I do the practice problem and get the wrong answer I can ask for the correct one. It gives the solution as 6700e^-0.005t - 6400 I'm not coming up with...

That's the problem. I didn't change weight to mass. Thanks for the help!

To solve for y, yes.

Sorry about that - I used the wrong terminology. It's supposed to be variation of parameters....

I have tried it. The method we were taught is to use wronskians to evaluate for y(p). My wronskians are w= -1, w1=sin(x)cos(x) and w2=-sin^2(x) When I assemble the integrals I get: integral sin(x)cos(x) dx which I evaluate with u substitution for u=sin(x)...

Thanks for the hint, Steve - that made it better.