What is the mass of 4 moles of helium, He?

How are chemical and physical properties related to chemical and physical changes?

Do any copper isotopes have a mass of 63.546 amu?

Both c5h12 and c5h11oh can be used as fuels. predict which compound would release a greater amount of heat per gram when it undergoes complete combustion.

In the same class two students find that a piece of wood with a mass of 70g has a volume of 103 cm3 they conclude the wood is oak is this accurate

A solution has a pH of 2.5. Answer the following questions. pOH = [H+] = [OH-] =

The rate constant is found to be 3.9 x 10-5 M-1 s-1. Calculate the rate of formation of ozone when the concentration of oxygen atoms is 3.0 x 10-14 molar and the concentration of diatomic oxygen is 1.3 x 10-14 molar.

The element Oxygen, O, is an example of which of the following? Question 8 options: A compound B molecule C atom D mixture

The measurement 0.41006 gram, rounded to three significant figures, is expressed as

1. When adding strong base to a buffer, why can we assume the equilibrium value of the OH - is zero?

When acid (X) reacts with base (Y) to produce Mg3 (PO4) 2 - what are X and Y