How many oxygen molecules are in 5.17g of oxygen gas​

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.