How do you calculate the percentage composition of Oxygen in #N_2O_5#?

1 Answer
Mar 1, 2016

Answer:

#25.93%# #N#, #74.07%##O#

Explanation:

You first need refrence a periodic table to find the weight of #N# and #O#

#N# = #14.0g#
#O# = #16.0g#

Multiply each element based on how many of each element are in the compound. for #N#, it is 2. For #O#, it is 5.

#14.0g# #O# * 2 = #28.0g# #N#

#16.0g# #O# * 5 = #80.0g# #O#

add the two weights together to get the total weight of #N_2O_5#

#28.0g# + #80.0g# = #108g# #N_2O_5#

Divide each elements weight by the total weight of the compound and multiply by 100 and you will have the percentage composition

#(28.0gN)/(108g)# * 100 = #25.93%# #N#

#(80.0gO)/(108g)# * 100 = #74.07%# #O#