# converting

1. ### Converting micromolar to grams/L

Hi, I'm facing a hard dilema right now. I need (though I don't know how) to convert 0.25 micromolar of Zinc Sulfate Heptahydrate to g/L, so I can weight it and put it on the water. The molecular weight of the Zinc Sulfate Heptahydrated is 287.541 g/mol Additional info: I need to run an...
2. ### Converting to Scientific Notation

Hi all. Is it necessary to keep the trailing zeros when converting to scientific notation? (Note: My use of ^ is to notate an exponent.) eg. 3100.0 x 10^2 My answer was 3.1 x 10^5 however the correct answer was 3.1000 x 10^5 (Is it pertinent to keep the trailing zeros?) Another example...
3. ### converting chemical structure to molecular formula

Hi there, I don't have a chemistry background, so am struggling a bit with this one. I am required to convert the (shown) molecule to a molecular formula, but i'm not understanding how to do this. I thought maybe it was as simple as just adding everything up, i.e answer C3H9, but realise...
4. ### Converting mg/mL to sample mass?

Hi everyone. I've got a problem that I've never been taught the solution to and I'm having difficulty in finding a clear answer. Here is my problem. I have an aspirin tablet and I want to find out if the amount of aspirin content in the tablet is the same as advertised on the box. It was...
5. ### Converting moles to atoms vice versa

This is more of a question about the mathmatics, specifically involving getting the exponents of the answer after dividing (converting from atoms to moles). I understand that when I'm given a problem such as: (1) Convert the number of moles of potassium containing 8.91 * 10^25 atoms. 8.91...
6. ### Converting mass into moles using base pairs

Hi, This is a more biochemical question, but I'm trying to figure out the moles of a piece of DNA- using just the following information ..... The genomic DNA is 20000ng (mass) and is 15000 base pairs long I know to get moles you have to do; Mass/ relative formula mass <--- but I don't...