Chemistry help please? PLEASE explain your answers, thanks!?

Hi---Could someone please help me??? I am struggling! PLEASE explain your answers so I can follow you. Thanks to all. All help is greatly appreciated! :) Calculate each of the following quantities: (a)Mass in grams of 0.57 mol of KMNO4 (b)Moles of O atoms in 8.18 g of Mg(NO3)2 (c)Number of O atoms in... show more Hi---Could someone please help me??? I am struggling! PLEASE explain your answers so I can follow you. Thanks to all. All help is greatly appreciated! :)

Calculate each of the following quantities:

(a)Mass in grams of 0.57 mol of KMNO4
(b)Moles of O atoms in 8.18 g of Mg(NO3)2
(c)Number of O atoms in 8.1x10^-3 g of CuSO4 * 5H2O
4 answers 4