At stp how many moles or helium would occupy a volume of 12 liters?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

Achemist reacted 57.50 grams of sodium metal with an excess amount of chlorine gas. the chemical reaction that occurred is shown. na + cl2 → nacl if the percentage yield of the reaction is 86%, what is the actual yield? show your work, including the use of stoichiometric calculations and conversion factors.