Answer:
The answer to your question is letter A
Step-by-step explanation:
Process
1.- Calculate the molar mass of KNO₃
KNO₃ molecular mass = 39.1 + 14.01 + (3 x 16)
= 39.1 + 14.01 + 48
= 101.11 g
2.- Use a rule of three to find the percent of nitrogen
101.11 g of KNO₃ --------------- 100%
14.01 g of N --------------- x
x = (14.01 x 100) / 101.11
x = 13.86%