How many moles of mgcl2 are there in 311 g of the compound

In 2002, the rare earth elements mine in mountain pass, california was closed because

What information does a complete ionic equation give that the balanced equation doesn’t show?

It takes 155. kj/mol to break a fluorine-fluorine single bond. calculate the maximum wavelength of light for which a flouine-flouring single bond could be broken by absorbing a single photon