What is the mass in grams of 2.01 x 10(22) atoms of mercury

The reaction q+r2=r2q is found to be first order in r2 and

This large tectonic plate is bounded on three sides by whats know as the ring of fire. what is the name of this tectonic plate? a) pacific plate b) eurasian plate c) north american plate d) indo- australian plate plz it's science but there's no option for science so i picked chemistry

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?