To calculate percent by mass, use the equation
below:
mass of element in compound 400
% element -
molar mass of compound
calculate the percent by mass of each element.
%n =
%h =
%o=

8

step-by-step explanation:

the best estimate is 3 because   8 can only go into 24 3 times

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answer: math isn’t just mysterious because the majority of us find it so difficult to understand – it’s also the basis of the universe, giving us clues to physical phenomena like the motion of gases in the atmosphere and the way that physical particles interact with each other amid all the possible variables in three-dimensional space.