Question

Calculate the mass of each substance from the number of moles given.
0.819 mol manganese(IV) oxide

Answer 1

well, this is other way around. First mass from m = n x M , molar mass as summing element's molar masses from periodic table --->
\[mass = percent of molar mass \times mass,m\] and for each element
percent of molar mass is the element's molar mass in molecule divided by molar mass, M

Answer 2

wait this is kinda of confusing

Answer 3

what part ?

Answer 4

percent of molar mass -meant-> ratio of molar masses.

Answer 5

I am confused in plugging in

Answer 6

could you be more specific X.^ http://www.webelements.com/

Answer 7

Actually I am really confused about the whole problem.
I mean I think I need help step by step.

Answer 8

ok. molar masses: MgO2 beacause oxygen have 2 electron less from stable 8 and Mg(IV) --> Mg 24,3 g/mol and O 16,0 g/mol safe and sound, always as that XD specific is 15,999...
--> so if whole molar mass is 24,3 + 2 x 16,0 = 56,3 g/mol
--> ................. ok :P , did the calculation and you don't need that way necessarily

so by the formula you have 2 oxygen and 1 magnesium in in one molecule, so what is the mass of 0,819 mol of manganese and how that molar amount change for oxygen ?