# king

### DIVISION/MULTIPLICATION WORD PROBLEM?? Find concentration of CO2 given particles per million and number of particles in air?

The concentration of CO2 in the air is 410 ppm. A breath of air contains approximately 1.2 × 1022 particles of air. How many of these particles are CO2?

How would go about solving this?

I have the following:

x ppm = (x molecules / 1 x 10^6 particles of air)

Can I just set it up like this?:

( 410 CO2 / 1 x 10^6 particles of air) * (x CO2 / 1.2 x 10^22 particles of air) ??

It's been a long time since I've had to do math, so some reinforcement/corrections would be really nice!

1 AnswerChemistry2 months ago### Justify how the fourth isotope of Sulfur is 32-S? ?

Sulfur has four naturally occurring isotopes, including 33-S, 34-S, and 36-S. Look at the periodic table, and tell whether the fourth isotope is 32-S or 35-S. Briefly justify your answer.

I know the answer to this is 32-S, but I'm not exactly sure how I know that. Looking at my periodic table, I'm using the mass number to determine this. However, that doesn't feel like the correct justification.

Can someone explain to me how to justify my answer?

1 AnswerChemistry2 months ago### Pain in wrist / dimple present?

I've been having on/off wrist pain for probably around the last year or two, but only in my left hand/wrist. I've noticed I have something of a dimple or indent in the back of my left hand, right below my wrist. It might even be considered my wrist, I'm not sure. This "dimple" is not present on my right hand.

But it really hurts.

I've found putting weight on it exacerbates the problem, so I try not to do so--but it does make doing things like working out quite difficult.

I'm not really sure what this could be, as Googling "dimple in wrist" or "indent in wrist" isn't giving me anything substantial.

Would love to know if anyone has any thoughts.

And BTW: I'm 20. Not sure if this is relevant info.

1 AnswerPain & Pain Management6 months ago### In the Communist Manifesto, what is the link between capitalism and imperialist expansion overseas? ?

In the Communist Manifesto, what is the link between capitalism and imperialist expansion overseas?

1 AnswerPolitics9 months ago### Paul Simon songs that mention states? ?

You guys ever notice how Paul Simon just loves to mention states in his song? Without going through his entire discography (including Simon & Garfunkel), I'm trying to put together a little list for myself. Any additions to this list?

1. Tennessee (Graceland)

2. New Mexico (Hearts and Bones)

3. Louisiana (That Was Your Mother)

4. New York (Darling Lorraine, The Only Living Boy in New York, Adios Hermanos etc.)

5. New Jersey (America)

6. Texas (The Late Great Johnny Ace)

Giving half-credit to:

1. New England (Duncan)

2. Washington D.C. (Armistice Day)

1 AnswerOther - Music11 months ago### ARE THESE VECTOR SPACES!?!?! DIMENSION???? BASIS!?!?!?

HELP!?

I'm having trouble figuring out how to do these problems. I'm not sure what "cln" is in the first one. I'm also not sure how to go about answering these questions since they are complex numbers!??! help???

1 AnswerMathematics2 years ago### Linear algebra help!?!?! Please I'm really stuck :(((?

I just don't understand what the answer(s) to all these statements are!!!!!!!! :((( please help, i'm really struggling!

1 AnswerMathematics2 years ago### HELP WITH SPANNING SETS!!!! PLEASE EXPLAIN WHY THIS IS FALSE!!!!!!!!!!! HELP!?!?!?!?

I don't understand how I would give a counterexample to this??? could someone help a gal out????!?!?!?

2 AnswersMathematics2 years ago### HELP!!! Finding Span(D) from a vector of R^3 ??!??!?!?

I did a lot of practice with vectors in R^2 but now that they're in R^3 idk how to do it?? someone please help!

1 AnswerMathematics2 years ago### Is the zero vector of R^3 under usual addition and multiplication an element of the given subset S? HELP!!?

I just did all of these, but I feel as though my work is not thorough. I also feel like some of my answers are incorrect, as I wrote "yes" for all of them.

Can someone help out and explain how to do problems like these ones?

1 AnswerHomework Help2 years ago### How do I find the zero vector and additive inverse of a vector space/matrix using arbitrary values?

The problem i have looks like this:

definition: [v1, v2] ⊕ [w1, w2] := [v1 + w1, v2 * w2]

(assume that these are vertical vectors sorry!)

how would i find the zero vector using v ⊕ z = v?

And how would I find the additive inverse of [-1, 9] using v ⊕ w = z?

1 AnswerMathematics2 years ago### LINEAR ALGEBRA: abstract vector spaces HELP!?

I am supposed to use the 10 properties of vector spaces to prove that these are vector spaces.

but i don't know how to do that!!! can someone please help?

1 AnswerMathematics2 years ago### Trig help! cos(x)=1/2?

Suppose x represents a number of radians of rotations. Use the unit circle to find the first three positive and first 3 negative solutions to the equations cos(x)=1/2. Explain how you found your answers.

2 AnswersMathematics3 years ago### Chemistry help! Solubility graph?

If 200 grams of potassium chloride were added to 400 grams of water at 30 degrees Celsius, would all of the potassium chloride dissolve?

Is it possible to heat it to any temperature and get it all to dissolve?

What temperature?

1 AnswerChemistry3 years ago### Let R be the region in the first quadrant bounded by the graphs y=root(x) and y=(x/3). Do not solve, just set up the equation.?

a) Find the volume when R is rotated around the axis at y = -2

b) Find the volume when R is rotated around the axis y = 4

c) Find the volume when R is rotated around the axis x = 0

d) Find the volume when R has cross-sections that are perpendicular to the x-axis and squares.

e) Find the volume when R has cross-sections that are perpendicular to the x-axis and are rectangles with a height of h = sin(x)

1 AnswerMathematics3 years ago### The rate of change of y with respect to t is proportional to 50 - y?

3 AnswersMathematics3 years ago### Metallic magnesium can be made by the electrolysis of molten MgCl2. How many minutes are needed to plate out 4g of Mg from molten MgCl2...?

Metallic magnesium can be made by the electrolysis of molten MgCl2. How many minutes are needed to plate out 4g of Mg from molten MgCl2 using 2.5 A?

1 AnswerChemistry3 years ago### Algebra word problem. Help!?

During a recent tennis match, Will hit what he thought was the perfect lob (a lob is a high shot design to go over your opponent). The path of the tennis ball can be represented by the quadratic equation b(x)= -1/10x^2 + 12/5x + 2.5, where x is the distance in meters that the ball travels horizontally, and b(x) is the height the tennis ball is above the ground in feet.

a) What is b(0)? What does it represent about the ball?

b) A standard tennis court is 23.8 meters long. If Will is standing right on the baseline when he hits the ball, does it land in the court? Show all your work.

2 AnswersMathematics3 years ago