Other Chemistry Answers

An unknown element (X) has two stable isotopes. 18X with a mass of 17.55 amu: has a % abundance of 83.55% while the other isotope is (19X) whose mass is 18.67 amu has a % abundance of 16.45%. What is the average and relative atomic mass of the unknown element?

Since electrons are moving so fast, we can never know their exact position.Who proposed the given statement

calculate the number of moles of oxalic acid in the 25.00ml that was pipetted for each trial.

Where do the complex biomolecules your body degrades during catabolism come from

1.Each Unia-Aspirin tablet contains 80mg of aspirin molecular weight 180.2 and to confirm compliance with the requirements of the contents a back titration with blank determination is done using sodium hydroxide was employed. The pharmacopeia acceptance criteria is that the tablet contains 95-105 %aspirin (1ml of 0.5 NaOH =0.4504 g of aspirin)
(a) state the need for a blank determination during titration
(b) how many moles of NaOH react with 1 mole of aspirin
(c) an aliquot of solution of Unia-Aspirin containing approximately 400 mg aspirin (equivalent weight of 5 tablets ) was titrated and titre found to be 9.3ml. A blank determination gave a titre of 0.4ml. Determine whether the product satisfies criteria of acceptance

How do you find a theoretical amount of a product within gas stoiciometry?

In the gravimetric analysis of iron, hydroxide may be added to a solution containing Fe2+ to

precipitate a gelatinous mess which is ignited to form Fe2O3. If 0.2864 grams of Fe2O3 were formed

from the ignition process, how many grams of FeCO3 were contained in the original sample that

was analyzed?

I am buying 25000 units of heparin powder (180 unit per mg). I need to dilute this heparin with saline so that 15ul will contain 30 units. How would I do this? Thank you!