¿Cuántos gramos de platino (Pt) hay en 25.63 moles de Pt?

Which formula can be used to calculate the molar mass of hydrogen peroxide

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.

What four properties do all waves have in common