How many moles in 3.69 x 10^30 molecules of carbon dioxide?

Why is helium considered as a noble gas

4. Which of the following statements correctly describe atoms? Select all that apply. A) Atoms have mass, B) Atoms are the basic unit of a chemical element. C) Matter is made of atoms. D) Atoms take up space.

A 12.2-g sample of X reacts with a sample of Y to form 78.9g of XY. what mass of Y reacted?

Why does a closed system mean that nothing could enter or exit

What are possible reasons for a percent yield that is under 100%

How does the conservation of matter relate to balancing equations?

Ethanoic acid and 1-butanol can react to produce water and a compound classified as an 1) aldehyde 2) amine 3) ester 4) halide

Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. which equation below best describes the balanced equation for this reaction?

2H2 + O2 - - > 2H2O If 16 mol of oxygen were reacted with excess hydrogen gas, how many moles of water would be produced?

Which subatomic particle identifies an atom as that of a particular element? how is this particle related to the atoms atomic number