Convert to moles: CuCl2 7.672 g

What is the density of the black hole

What are the charges of the subatomic particles by choosing the answer from the drop down menu. protons have a (+1,0,or-1). (protons, neutrons, electrons) have a 0 charge. 3.) electrons have a (+1,0,-1)

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?