Other Chemistry Answers

During normal conditions the respiratory gases were mixed 25 dm3 of carbon dioxide with 10 dm3 of oxygen. Express the composition of gas mixture in the volume percentage.

A sample containing ammonium chloride was warmed with 100 mL of 1.00 moldm-3 sodium
hydroxide. After all the ammonia had been driven off, the excess sodium hydroxide required
50.00 mL of 0.250 moldm-3 sulfuric acid for neutralisation. What mass of ammonium chloride did
the sample contain?

The chlorine present in PVC has two stable isotopes. 35Cl with a mass of 34.97 amu and 37CI with a mass of 36.95 amu. Given chlorine's atomic mass of 35.45, what is the percent abundance of each isotope?

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

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!