Question

A compound weighing 115 g contains 68.3 g of carbon, 13.2 g of hydrogen, 15.9 g of nitrogen, and some amount of oxygen. Solve for the mass percent of oxygen in the compound.

A.) 11.48%
B.) 15.30%
C.) 13.83%
D.) 13.91%

Answer 1

Weight of the compound = 115 gm
Weight of carbon = 68.3 gm
Weight of hydrogen = 13.2 gm
Weight of nitrogen = 15.9 gm
Then
Amount of oxygen = 115 - (68.3 + 13.2 + 15.9)
                              = 115 - 97.4
                              = 17.6 gm
Percentage of oxygen = (17.6/115) * 100
                                    = 15.30 percent
From the above deduction, it can be concluded that the correct option among all the options that are given in the question is option "B". 

Answer 2

Answer:

For Edmentum/Plato users, the correct answer is B. 15.30%