A sample of crushed rock is found to have 4.81 x10^21 atoms of gold. How many moles of gold are present in this sample?

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Identify two types of chemical bonding in the source of dietary potassium